Best Tankless Water Heater 2022 – Reviews And Buying Guide

Are you on the outlook for the best tankless water heater? If you’re nodding your head in “YES,” you have landed at the right place.

Perhaps, your existing water heater is out of order and needs replacement, or you’re thinking about switching from a standard tank water heater to something more efficient.

Whatever the reason is, we’re here to assist you to pick the best unit for your home.

The best gas condensing tankless water heater is exceptionally handy for use in your kitchen, bathroom, cabin, or anywhere else you need a source of warm water.

The traditional water boilers are inefficient, occupy more space, consume excessive amounts of energy, and have inadequate hot water storage capacity. They produce small batches of warm water once at a time.

However, if you want to enjoy long showers without running out of hot water, you need a tankless water heater. They provide a limitless supply of hot water throughout the day without consuming lots of power.

It’s accurate that they come with a higher initial cost, but they can help you save your hard-earned money in the long run.

The tankless water system is making a buzz in the market due to its excellent performance and the never-ending supply of instant heated water.

There are numerous advantages that you and your beloveds will enjoy once you deploy it in your house. The most exciting thing about it is that it doesn’t require tedious ongoing maintenance and you won’t have to replace it after twelve to fifteen years of use.

  • Best Value

    Stiebel Eltron Tempra 24 Plus Electric

    Stiebel Eltron Tempra 24 Plus Electric
    • Continuous Water Flow
    • Space And Power Saver
    • Easy Operation
  • Budget Pick

    EcoSmart ECO 27 Electric

    EcoSmart ECO 27 Electric
    • On-Demand Limitless Warm Water
    • Digital Temperature Control
    • Compressed And Wall-Mounted
  • Premium Pick

    Eemax EEM24013 Electric

    Eemax EEM24013 Electric
    • Easy To Install
    • Temperature Control
    • Made Of Stainless Steel Material

Using either gas or electricity, most systems can warm two to five gallons of water in a minute. Gas heaters have a higher flow rate than the electric ones, so they can produce five gallons of hot water per minute. 

On the other hand, electric heaters are designed to be more energy-efficient, but they struggle to supply hot water as quickly as other options.

Many folks are confused about what to look for while choosing the perfect tankless water unit.

Therefore, we have crafted this comprehensive review and buying guide to help you figure out the right option for your specific water heating needs, so that you can make a wise buying decision.

Whether you have a small or large family, one of these units will be the perfect one for you.

Best Tankless Water Heater 2021

Stiebel Eltron Tempra 24 Plus Electric Best Overall9.8

Stiebel Eltron Tempra 24 Plus Electric

  • Space And Power Saver
PriceRead our Review
EcoSmart ECO 27 Electric9.5

EcoSmart ECO 27 ElectricFeature:

  • Output Water Temperature Range Of 80°F – 140°F
PriceRead our Review
Eemax EEM24013 Electric9.5

Eemax EEM24013 ElectricFeature:

  • Instant, Continuous, And Limitless Hot Water Supply
Rheem 240V Heating Chamber RTEX 139.5

Rheem 240V Heating Chamber RTEX-13Feature:

  • Adjustable Digital Thermostatic Control
PriceRead our Review
Rinnai V65IN Natural Gas Heater9.4

Rinnai V65IN Natural Gas HeaterFeature:

  • Safe And Durable
PriceRead our Review
Rheem 240V 2 Heating Chambers9.5

Rheem 240V 2 Heating ChambersFeature:

  • Self-Modulating Technology
PriceRead our Review
EcoSmart ECO 11 Electric9.5

EcoSmart ECO 11 ElectricFeature:

  • Components Are Made Of Either Copper Or Stainless Steel
PriceRead our Review
Eemax EEM24027 Electric9.4

Eemax EEM24027 ElectricFeature:

  • Energy Economical Unit
PriceRead our Review
Bosch Electric Mini Tank 7 Gallon9.5

Bosch Electric Mini-Tank 7-GallonFeature:

  • No Long Waiting Time
PriceRead our Review
Rinnai RL Series HE Indoor9.5

Rinnai RL Series HE+ IndoorFeature:

  • Higher Flow Rate Of 7.5 Gallons Per Minute
PriceRead our Review
Titan Electric Tankless Water Heater

Titan Electric Tankless Water HeaterFeature:

  • Best For Warmer Climates
PriceRead our Review

1. Stiebel Eltron Tempra 24 Plus Electric – Best Overall

It is considered to be one of the best electric water heating systems currently available in the market. It arrives engineered with a cutting-edge temperature controlling system that guarantees constant water temperature for your comfort.

Best Overall
Stiebel Eltron Tempra 24 Plus Electric Best Overall

Stiebel Eltron Tempra 24 Plus Electric


  • Continuous Water Flow
  • Space And Power Saver
  • Easy Operation
  • Water Temperature Output Of 86˚ To 140˚F
  • 7-Year Leakage And 3-Year Parts Warranties

This unit has a small and sleek white design that makes it a perfect choice for a small house. The compact design requires no venting as well.

It saves a lot of space and delivers an uninterrupted stream of hot water at a temperature ranging from 86˚ to 140˚F. The German tankless water heater is noise-free while in use.

It doesn’t waste any power because it doesn’t store hot water inside it. The eco-friendly system is capable of measuring water flow electronically. It has a savings monitor that demonstrates how much you save on power costs. 

The product uses 15 to 20% less power as compared to traditional tank water heaters. However, you can save more power depending on your specific water needs.

The European tankless water unit comes with a digital temperature display and preset temperature memory buttons.

The sleek design and digital controls permit it to be a wall-mounted water system. If you want, you can also hide it under the sink or within a closet.


  • Brand: Stiebel Eltron
  • KW: 24 KW
  • Voltage: 240 V


  • Uses 15 To 20% Less Energy
  • Doesn’t Require Extra Venting
  • Maintains Steady Temperature Supply
  • Control Temperature Through Digital Controls
  • Easy Installation


  • Expensive

2. EcoSmart ECO 27 Electric

One of the primary reasons you may be thinking about getting the best tankless water heater is the potential to save some bucks. Warming cold water requires energy, but the EcoSmart electric tankless water heater is manufactured with competence and reliability in mind.

Great Value
EcoSmart ECO 27 Electric

EcoSmart ECO 27 Electric


  • On-Demand Limitless Warm Water
  • Advanced Self-Modulating Technology
  • Compressed And Wall-Mounted Design Frees Up Floor Space
  • Digital Temperature Control
  • Easily Replaceable Copper And Stainless Components
  • Output Water Temperature Range Of 80°F – 140°F

It uses less power and supports you save money. It can reportedly save up to 50% of water heating costs, thanks to the patented modulation system.

The unit has a compact size, so it can fit in tight spaces around the house conveniently. The digital controls empower you to control and refine the temperature in 1-degree increments, so you set the temperature from 80°F – 140°F.

It comes with easy-to-replace, durable, and efficient copper and stainless components. The sophisticated and innovative design is pleasing to the eyes.

The best tankless water heater for condo is a perfect option for homes in the northern United States where the water temperature can reach as low as 37°F.

It is capable of heating 3 gallons of water in 60 seconds. It can provide hot water for up to two showers simultaneously and never run out of water. 


  • Brand: EcoSmart
  • KW: 27 KW
  • Voltage: 240 V


  • Limited Lifetime Warranty
  • Save Up To 50% In Water Heating Costs
  • Highly Durable And Efficient
  • High GPM For An Electric Unit


  • Slightly High Price
  • Warranty Requires Professional Installation

3. Eemax EEM24013 Electric

Eemax electric tankless water heating system delivers instant, constant, and a never-ending supply of hot water and only heats it where and when you want.

Premium Choice
Eemax EEM24013 Electric

Eemax EEM24013 Electric


  • Easy To Install
  • Temperature Control
  • Instant, Continuous, And Limitless Hot Water Supply
  • Heat Up To 2.4 Gallons Per Minute
  • Made Of Stainless Steel Material

The heater has advanced self-modulating technology that helps you save your hard-earned money on electricity bills.

It is the best tankless water heater for jacuzzi tub that can be used for any of your residential or commercial hot water needs. It can adjust how much power needs to be input based on how much warm water is required.

This unit is exclusively crafted to handle small apartments in warmer climates or point of use applications. In cold climates, it can supply warm water for one sink only.

However, in warm climates, it can provide hot water for one sink and one shower. Its compact size allows you to install it wherever you want and save a lot of storage space. This product has the capability to heat up to 2.4 Gallons per Minute.


  • Brand: Eemax
  • KW: 13 KW
  • Voltage: 240 V


  • A Sufficient Flow Rate
  • Compact Design
  • 5 Years For Leaks And 1 Year For Parts Warranties
  • Self-Modulating Technology
  • Energy Efficient


  • Best For Point Of Use Or A Small Apartment Only

4. Rheem 240V Heating Chamber RTEX-13

Rheem heating chamber is a small, durable, and efficient system that offers exceptional results. Going tankless has countless advantages, and this particular unit truly shows this off.

Rheem 240V Heating Chamber RTEX-13

Rheem 240V Heating Chamber


  • Adjustable Digital Thermostatic Control
  • Copper Immersion Heating Elements
  • Energy-Efficient
  • Easy To Install
  • A Maximum Flow Rate Of 3.17 GPM
  • Supplies Warm Water To Multiple Fixtures

This energy-smart water heating system works faster and gives on-demand hot water for a single point-of-use or numerous applications. It is a perfect option for those who have a small house or apartment.

The compact system can fit onto any wall in the kitchen, bathroom, cabin, or anywhere else where you may need hot water. The front face of this best tankless water heater features very user-friendly controls to regulate the temperature in increments of 1°f.

External adjustable digital thermostatic control with LED display enables you to change the water temperature as per your needs rapidly.

This model uses two copper immersion heating elements to keep the water warm. These copper immersion heating components are long-lasting, so you will be able to use this water heater for a longer period.

The installation of the Rheem heating chamber is very easy, and it uses 1/2 NPT adapters included. It utilizes side 1/2 inch compression water connections as well.

This outstanding water heater features a flow rate of up to 3.17 gallons per minute.


  • Brand: Rheem
  • KW: 13 KW
  • Voltage: 240 V


  • Lowers Water Heating Costs
  • Save Plenty Of Valuable Storage Space
  • Give Constant Flow Of Hot Water
  • Temperature Control Is Extremely Accurate
  • 5 Year No Leak And 1-Year Parts Warranties


  • Perfect For Small Houses Only
  • Can’t Exceed The Flow Rate Of 3.17 Gallons Per Minute

5. Rinnai V65IN Natural Gas Heater

The Japanese-made Rinnai V65IN is the best tankless water heater for high altitude. It’s a perfectly reliable, durable, and economical solution for medium-sized homes.

Rinnai V65IN Natural Gas Heater

Rinnai V65IN Natural Gas Heater


  • Good Overall Design
  • Great Performance
  • Easy To Install And Use
  • Safe And Durable

If you have never used a tankless unit earlier, then you must obtain it because of its compact size and exceptional performance. It will unquestionably satisfy your high expectations.

It is superior to standard heaters in almost every way as it delivers on-demand warm water instead of re-heating and storing it.

The biggest reason to acquire it is that it takes up less space, can be installed anywhere in your house, and uses less energy.

This product is equipped with ThermaCirc360 technology that recirculates hot water through the pipes, so you can get hot water faster. It never runs out of the water, so you will not have to wash your clothes or utensils with cold water.

This unit uses natural gas in a safe manner to heat water as it passes through the heat exchanger. It has the capacity to supply up to 6.5 gallons of warm water in 60 seconds. You can run two showers, a laundry machine, and a dishwasher simultaneously.

If you want to increase the water temperature than the pre-set 120 degrees, you can take advantage of the temperature control to increase it up to 140 Fahrenheit. By dropping the output temperature to 98 degrees, you can save more power.

The small and lightweight heater arrives with anti-frost protection and leak detection water shut-off, so it doesn’t only supply a limitless stream of hot water but protects your investment and property from damages as well. In case of leakage inside the heater, it will shut off its water supply valve automatically. 


  • Brand: Rinnai
  • Gas Type: Natural Gas
  • Voltage: 120 V
  • Gas Line Fitting: .5 Inches


  • Continuous And Adjustable Warm Water Supply
  • Anti-Frost Protection And Leak Detection Water Shut-Off
  • Compact Wall-Mounted System
  • Thermacirc360 Technology
  • Provide Hot Water For Up To 4 Fixtures At Low Energy Costs
  • 10 Years Warranty On Heat Exchanger
  • 5 Years Warranty On Additional Parts
  • Best For Mobile And Manufactured Houses


  • Unsuitable For Larger Homes
  • Expensive Than Standard Water Heaters

6. Rheem 240V 2 Heating Chambers

This residential tankless heater is packed with numerous positive features and it is one long-lasting investment to make for your house. It’s not only reliable and powerful, but it also ensures constant and uninterrupted performance for a longer time.

Rheem 240V 2 Heating Chambers

Rheem 240V 2 Heating Chambers


  • Small And Compact
  • Self-Modulating Technology
  • Regulate The Temperature According To Your Need
  • Temperature Ranges From 80°F – 140°F
  • Minimum Output Is 0.5 GPM
  • Maximum Output Is 4.4 GPM
  • Easy To Use And Operate

It has a sleek design that makes it look subtle and elegant no matter in which corner of the house you fix it. An external digital thermostatic control with LED display (+/1 degree accuracy) will catch your attention instantly.

The digital temperature control makes it uncomplicated for you to operate the unit. This responsive and user-friendly product enables you to adjust the water temperature as per your need.

You can fine-tune the temperature from 80°F to 140°F. This model is crafted with self-modulating technology that can regulate the power to meet hot water demand.

Rheem 240V 2 water heater has two durable copper immersion heating elements and field serviceable. It provides a flow rate of up to 4.4 gallons per minute.

This system can be utilized for several applications. It is 99.8% energy-efficient, so you can expect to save a huge amount on your electricity bills.

This best water tankless heater is threaded for easy and quick installation and replacement. Its digital temperature display makes it easier for you to use it.


  • Brand: Rheem
  • Color: Grey
  • Voltage: 240 V


  • Energy-Efficient
  • Customer Service Is Outstanding
  • Installation And Replacement Is Easy
  • Reasonable Price
  • Takes Up Less Space


  • Draining Issues
  • Seal Issues
  • Can Only Cater To One Application At A Time

7. EcoSmart ECO 11 Electric

It is an electric water heating system which means you won’t have to use burners or flames like gas heaters. Its installation process is extremely simple, quick, and inexpensive.

EcoSmart ECO 11 Electric

EcoSmart ECO 11 Electric


  • Self-Modulating Technology
  • Compact Size
  • Components Are Made Of Either Copper Or Stainless Steel
  • Save Up To 60% On Energy Costs
  • Digital Temperature Control

You can install it in any corner of your house, thanks to its compact size. It doesn’t need a ventilation system and can heat up water to 105 °F.

This unit comes with a digital control which lets you alter the temperature in 1-degree increments on the system itself.

The temperature controls provide maximum control to the user over the heater and assure stability in producing warm water.

If you are willing to cut your monthly expenditures, this product is an ideal option for you. It helps you save up to 60% on your electricity bills and invest money on something more important.

The EcoSmart Eco 11 operates in a proficient manner and can be used for single or multiple applications. It’s perfect for smart apartments and is designed to heat up to 2 gallons per minute.

The unit uses self-modulating technology that provides constant hot water supply and also decreases power consumption.

In the warmer climates, it has the ability to handle two sinks running at the same time. In cold weather, it can handle two sinks or one shower simultaneously.


  • Brand: EcoSmart
  • Voltage: 220 V
  • Wattage: 13000 Watts


  • Optimum Performance
  • 99.8% Energy-Efficient
  • Designed For Small Apartments Or Homes
  • Heat Up To 2 Gallons Of Water In 60 Seconds
  • Can Be Utilized For One Or Multiple Applications
  • Limited Lifetime Warranty
  • Endless Hot Water Supply


  • Must Be Fixed By An Experienced Plumber

8. Eemax EEM24027 Electric

Eemax EEM24027 is the best tankless water heater for small spaces. It has a slim, stylish, and compact design that makes it effortless to store. This powerful and dependable heating unit supplies hot water continuously and never runs out of hot water.

Eemax EEM24027 Electric

Eemax EEM24027 Electric


  • Energy Economical Unit
  • Rugged Built
  • Compact Size
  • Self-Modulating Technology

It works on-demand which makes it reasonable for energy. Additionally, this system is armed with self-modulating technology for optimum hot water use. The long-lasting and user-friendly product is easy to operate and tune to required settings.

It is an ideal option for any residential or commercial water heating requirements. It is designed to produce hot water for up to one shower and two sinks at the same time in colder climates. In warm weather, it can produce warm water for up to four showers or sinks at once.

If you are looking for a visually appealing and less neutral best tankless water heater for jacuzzi tub, you can spend your hard-earned money on this unit. You can install it anywhere in your house such as a kitchen, bathroom, or any other place where hot water is needed.

The installation procedure is stress-free and requires only a few moments. It comes fully assembled and all hardware required for the deployment is included.


  • Brand: Eemax
  • Voltage: 240 V
  • Wattage: 27000 Watts
  • Kw: 27 Kw


  • Visually Appealing Blue-Colored Heater
  • Saves A Lot Of Storage Space
  • Decent HVAC Specs
  • Instant, Constant, And Never-Ending Warm Water Supply
  • Good Power And Weight Ratio


  • Obtainable In 27 Kw Model Only

9. Bosch Electric Mini-Tank 7-Gallon

It is one of the highest-rated tankless water heaters available in the market. There’s no surprise, though, because it’s long-lasting, energy-efficient, and space-saving. This highly functional unit is very easy to use and provides an on-demand endless hot water supply.

Bosch Electric Mini-Tank 7-Gallon

Bosch Electric Mini Tank 7 Gallon


  • Easy And Convenient Installation
  • On-Demand Hot Water Source
  • Compact Size
  • No Long Waiting Time
  • Three Different Sizes Obtainable
  • Horizontal Or Vertical Orientation
  • Reliable And Long-Lasting

It is super-easy to install and can be mounted on a shelf, wall, or floor. The Bosch Thermotechnology can fit under a sink or in a cabinet because it has a small, compact, and attractive design. If you will mount this larger unit vertically, it will give you 7 gallons of hot water per minute.

However, if you will install it horizontally, it will provide 5.1 gallons of warm water. Just bear in mind that vertical orientation is installed with hot and cold water lines above it. This outstanding model is 98% energy-efficient which means it can support you to save a significant amount of money on electricity bills.

It is capable of heating water between 65 and 145 degrees F, so you can choose the ideal temperature as per your need. It features zero CFC foam insulation for maximum energy-efficiency as well as a glass-lined tank for durability.

You can expect to utilize it for a longer-term. This product has an operating pressure of 150 Psi that helps it to stay in excellent condition and prevent damages as well. The unit needs ¾-inch Male NPT and electricity source of 120V and 12A when it comes to fittings.


  • Brand: Bosch Thermo technology
  • Water Pressure Range: 150 PSI
  • Electrical Requirements: 12A / 120V
  • Wire Type: Hard Wired


  • Help You Save Money On Electricity Bills
  • Shelf, Wall, Or Floor Mounted
  • Installed Vertically Or Horizontally
  • Simple And Elegant Design
  • Great For Small Spaces


  • A Little Expensive

10. Rinnai RL Series HE+ Indoor

Rinnai RL HE+ Indoor best tankless water heater is a great option for a large family in the house. This product comes with a higher flow rate of 7.5 gallons of hot water per minute, so it can serve a family with a decent amount of water.

Rinnai RL Series HE+ Indoor

Rinnai RL Series HE Indoor


  • Control-R Wifi Module
  • Thermacirc360 Technology
  • Higher Flow Rate Of 7.5 Gallons Per Minute
  • Durable Construction

It features ThermaCirc360 technology that assists you to set water recirculation patterns. It helps the system to supply hot water only when you need it. The indoor water heater has a smart connectivity option that permits the user to acquire control over the unit. 

With the Control-R WiFi module, you can effortlessly get connected and joined with the system through your smartphone. This feature helps immensely when you are away from home and still want to operate the unit.

It uses 40% less energy than traditional tank water heaters because it provides on-demand hot water. It offers a 120 months warranty for heating element, a 60 months warranty and 12 months warranty on numerous parts and labor respectively.

The most attractive thing about Rinnai RL HE+ is the durable construction it has both for the interior and exterior. The interior is made of stainless steel components that have the ability to lower the amount of limestone production within the system. You can expect to use this product for 20 years.

It has a compact design, so you can install it in non-traditional spaces such as a closet, attic, or even a cabinet. The best gas condensing tankless water heater helps you save 16 square feet of space because it has only the size of a small suitcase.


  • Brand: Rinnai
  • Energy Efficiency Range: 0.81 – 0.82
  • Voltage: 120 Volts
  • Usage: Indoor Use Only


  • Save Valuable Space
  • On-Demand Limitless Hot Water
  • Sustainable
  • Reliability


  • Very Costly
  • Indoor Installation Only

11. Titan Electric Tankless Water Heater

It is the best tankless water heater for adu that can provide a constant stream of warm water for your entire house, apartment, and office and keeps the water temperature stable. This space-saving unit is a perfect choice for an average size house.

Titan Electric Tankless Water Heater

Titan Electric Tankless Water Heater


  • Constant Flow Of Hot Water
  • Best For Warmer Climates
  • Easy To Install
  • Adjustable Temperature Control Switch
  • Small Space Required

As it heats the water only when you need it, so it helps you save up to 60% money on energy costs. It never runs out of the water, so you can enjoy long hot showers in the cold weather.

This product is designed to be used in warmer climates where the groundwater temperature is above 65 degrees (F). Its installation process is very easy and simple and you will need to spend only a few minutes to fix it in your desired area of the house.

The Titan heater comes with an adjustable temperature control switch that allows you to dictate the temperature. It has a small and compact design, so it can fit in tight spaces effortlessly.

It has the capacity to deliver hot water for one to three bedrooms, and it uses less energy than its contemporaries. The best thing about this smaller size system is that you will never experience any change with regards to the water temperature. 


  • Brand: Titan
  • Pattern: N-120
  • Voltage: 220 V
  • Maximum Amps: 54


  • Ideal For Medium Size House Or Apartment
  • Energy-Efficient
  • Allow You To Set Temperature According To Your Need


  • Sometimes Provides Less Water Pressure
  • Water Temperature Fluctuate When More Than One Faucet Is Used

Best Tankless Water Heater 2021 (Buyers Guide)

The majority of people love hot baths or showers. It has been proven that a hot shower has countless health benefits. If you are having a bad day, take a hot bath to instantly boost your mood. People take a shower before going to work because it brightens their mood and help them concentrate better.

While these are its comforting advantages, it is a basic necessity of folks who live in the coldest countries. Therefore, it’s necessary to install a water heater in your house to survive in colder climates.  

You don’t need hot water for shower only, but for day-to-day domestic chores as well. You can’t wash clothes, dishes, and clean the house with cold water when the temperature outside is dripping low. To complete all these errands, you need hot water. It can be annoying and tiring to heat water every time for every single activity.

There may be some spaces in your house or office such as a kitchen or bathroom where you need constant and frequent hot water. That’s why; it is highly recommended to invest money in a heating system to acquire on-demand warm water.

What Are The Different Types Of Water Heaters?

Have you decided to acquire a water heater and now, you are looking for a perfect option? While doing research, you will understand how vast the market is and how complicated it is to choose one option out of many.

A layman doesn’t purchase a water heating system on a regular basis, so it is fair that the majority of us don’t know about the diverse types of water heaters. They are a heavy investment, so make sure to invest your money wisely.

Now, let’s talk about the diverse types of water heaters available out there. 

Conventional (Tank) Water Heaters

A tank water heater is the most common and traditional type of water heaters available currently in the market. It arrives with a tank that stocks water to be heated. The capacity of the tank determines how much hot water you can hold at once.

It provides up to 40 gallons of hot water before it runs out. The tank is insulated which means it doesn’t only heats the water, but also keeps it warm until it is needed. It is compulsory to keep it on if you want the deposited water in the tank heated.

It has two valves, a temperature control valve, and a pressure control valve that helps the user to preserve the heat inside the unit, so that it is not over or under heated.

If the tank size is small and you have a big family, you may run out of the water and have to wait for an extended period of time for the next container to be heated.

Just because it works nonstop, so you will have to clean it frequently to increase its lifespan. It is critical to clean it twice a year to eliminate mineral deposits and reduce corrosion.

It is not mandatory to clean it and it works properly even without being cleaned, but won’t last long. The average lifecycle of a standard tank heater is up to ten to twelve years only.

Condensing Water Heater

If your home uses natural gas as its primary energy factor and has gas lines around, then condensing heater is an ideal fit for you. It comes with a tank just like standard heaters and utilizes the unused gas vapors at your residence to produce heated water.

The gas vapors funnel through a coil situated at the bottom of the container to heat the water. It consumes a very little amount of energy (apart from the gas vapors that are burned somewhere else like by your oven or stove) to heat the water.

As it is a tank-style model, so make sure to get a bigger size for your family. It has the capacity to provide more than 55 gallons of hot water.

On-Demand (Tankless) Water Heater

It is equipped with innovative technology and has no tank hooked to it. It is designed to provide you a nonstop stream of hot water for your house. Heater has super-heated coils that fill with water and heat it promptly as you require it.

That’s why; it is referred by on-demand heater by numerous people. They arrive in various sizes, so you need to make sure that you are getting the right size according to your individual household needs. The life expectancy of these units is average 10 to 15 years.

Solar-Powered Water Heater

They are the most energy-efficient heaters and rely on the heat extracted from the sun as its energy source. However, it can function only if you have installed solar panels in your house or thinking about deploying them.

It can work well if you live in a warmer habitation or climate and can help you save a lot of money. The warmth of the sun is utilized to run the heater. It transfers the energy to a closed-loop system that contains a heat-conductive material which then, heats the water in the container.

To take advantage of this unit to the fullest, it requires a backup plan such as electricity or gas, so that you can continue to get warm water on cloudy days.

Heat Pump Water Heater

This style of water heater comes with a tank, but it doesn’t utilize electricity directly to produce hot water. So, you will not have to pay heavy electricity bills every month. The uniqueness of this heater is that it relies on pulling heat from the air and ground to heat water.

It means they use electricity only to pull heat from the air or ground to the water. It is a perfect option for those who want to save money on power costs. They use 60% less power than other standard types of heaters.

It has a pump on the top, so you will have to place it in a wide room. The drawback of this style is that it doesn’t work efficiently in colder spaces or climates and it’s a very costly heater to purchase.

How Does The Best Tankless Water Heater Work?

As the name suggests, it delivers a limitless supply of heated water. It is linked to a supply system and doesn’t need an integrated heating tank like conventional heaters.

When the user turns on the tap, the cold water passes through the system where a gas burner or electric component heats the water promptly.

It does not stock hot water inside it, so you won’t have to wait for an extended period to get hot water. It is also well-known as an on-demand heating system because it gives you hot water only when you need it.

They are specifically manufactured to ensure a never-ending supply of warm water and cut back on power consumption. The unit delivers warm water at a reliable rate of around two to five GPM.

Gas tankless heaters have a higher water flow rate than the electric units but they provide a limited amount of water in the large apartments or homes.

With a gas heater, it may be difficult to get hot water in your sink and dishwasher at once. To resolve this issue, you can deploy multiple tankless heaters for different applications. 

Major Types Of The Best Tankless Water Heater

There are various diverse styles of tankless water heaters. They have evolved with the passage of time, and pioneering features have been added to make them better.

It is necessary to understand the differences between all heaters to obtain the one that best suits your individual household needs. Let’s take a quick look at major types of tankless heating systems to understand them in more detail.


They are the first generation of tankless heaters and are very prevalent in Japanese and European regions. People who use these units are extremely gratified with their dazzling performance.

This system has a heat exchanger that delivers hot water as per your demand, with an energy-efficiency factor of between .82 and .85. It helps you save up to $70 to $80 every year on electricity bills as compared to a tank water heater.

The only drawback of this unit is that the exhaust is both hot and destructive, so it becomes vital for the users to install expensive stainless steel venting. It is less bulky and cost-effective than condensing heaters.


These units belong to the second generation of the tankless water heaters and can be vented using cost-effective PVC materials. It has a second heat exchanger that reuses the heat from the exhaust to do further heating. It is designed to give you a higher energy efficiency of between .92 and .94.

By using this system, you can easily save up to $90 to $100 on energy expenses annually. The only downside of them is that they arrive with a very high price tag as compared to non-condensing heaters.


They are well-known as condensing hybrid water heaters and belong to the third generation of the tankless water heaters. It was invented in the USA and is not entirely tankless, but a more innovative unit that contains a small 1 or 2-liter tank that is utilized to stock heated water.

It eliminates the drawback of lower energy efficiency of short draws found in the above two mentioned water heaters. The hybrid unit has an energy efficiency of .92 to .96, so you can expect to save up to $120 annually on the gas expenses. They are more energy-efficient but have a higher price tag.

Point Of Use

They eliminate heat loss in the warm water storage unit. As the name “point of use” suggests, it is designed to heat water as close as possible to the outlet such as shower and sink. They help the user to increase water temperature at a fixture positioned away from the central heating system.

It is highly suitable for larger houses and offices and provides better energy efficiency. However, if you will install multiple “point of use” heaters separately in your bathroom, kitchen, or cabin, you will have to invest a heavy amount.

What Are The Different Energy Types Of Tankless Heating Systems?

Many people make a mistake while choosing the type of fuel/energy for their tankless heating unit. The fuel type has a great impact on the following factors:

  • Usage
  • Size
  • Energy Efficiency

It determines how much money you will have to spend annually on electricity bills. Before building a house, make sure to choose the fuel type wisely because altering the fuel sources later can be very costly. There are several different fuel types for tankless heaters such as electricity, gas, and propane.


The best tankless water heater for high altitude powered by natural gas is cheaper as compared to electric and propane-powered heaters. It has an upgraded performance and a constant high heat output.

This unit is more energy-efficient and heats faster, so you will get hot water quickly. However, to keep it in good working condition, you will have to invest money on regular maintenance service.


The best thing about them is that they are easier to purchase and install than other types of heaters. However, they require a higher amount of energy to operate. They have a simplistic and compact design, so they are easier to repair and need minimal maintenance.

An electric best tankless water heater is cheaper and doesn’t generate exhaust gases, so it doesn’t need extra venting. The environment-friendly unit is more stable than gas heaters, so it is preferred by many homeowners.


As the electricity costs are increasing day by day, so the propane-powered water heater is an energy-efficient and affordable option for you. They can dramatically lower your energy bills and help you save a lot of money in the long run. It provides a constant stream of warm water as per your demand.

Essential Things To Consider Before Purchasing The Best Tankless Water Heater

Before you go out and purchase a tankless heater, there are some important things that you need to consider, so that your family can get a continuous supply of hot water and you can save your money on energy bills.


Before making a final buying decision, think about how much do you plan to utilize the water heater. Do you live alone in your apartment or live in a large house with 7 to 8 people that are also going to utilize the warm water?

You need to pick a unit that has the capability to provide a sufficient amount of hot water to satisfy your needs. Having the right option will enable you to enjoy hot water 24/7.  


Always buy a unit that comes with the option of a warranty. It does not matter how prevalent the system is for its extraordinary performance, affordability, and reliability, carefully consider what is covered by the offered warranty and for how long. Inquire them if the installation charges of the heater are also included in the cost price or not?


The price of the unit is one of the most important factors that you can’t overlook at any cost. First of all, decide how much you are willing to invest in the best tankless water heater and then, find the options accordingly.

We always want to pick a product that has the lowest price. However, remember that the water heating unit is not a one-time investment. Repair, maintenance, and many other expenses are attached to it. While determining the price of a unit, consider these expenditures too.

The cost is highly reliant on the manufacturer, size, and time of the year that you purchase. In winter, you will get very expensive deals, but in summer, you will obtain cost-effective good deals. There are some models available that are eligible for a tax rebate, so find out those options before buying.


When choosing the best tankless water heater, bear in mind the climate of the place where you live. If you stay in a cold country, then you are going to utilize the heater a lot.

So, pick a reliable product that supplies nonstop water and doesn’t give away because the heater is mandatory for your survival. However, if you live in a warmer climate, then you can opt for a lesser power system.


A tankless water heater is a heavy investment and the maximum times you will purchase it in your entire life is twice. So, make sure to spend money on a reputed and dependable brand.

For making an informed decision, visit their website and social media pages to read the testimonials of their previous clients. A good brand will ensure great performance, less cost, and provides excellent customer service too.


It is highly recommended to narrow down options after considering the size of the unit and the capacity available at your house. Then, pick a product that is compact and suits the other needs as well. Selecting a size without considering the capacity of your house can be a disaster.

Energy Saving

If you are conscious about the environment and want to save money on energy bills too, then pick an energy-savvy option obtainable in the market. There are countless options that will not use a high amount of electricity.

Fuel Type

There are various kinds of fuels for tankless units, so carefully decide which option you would like to utilize to operate your heater. While deciding, consider the cost that you want to invest, fuel type available in your locality, and your preference towards energy efficiency and performance.


When buying a product, make sure it is easier to maintain and requires minimal necessary efforts to keep it running for the long-term. 

Pros And Cons Of Using The Best Tankless Water Heater

Just like any other product, tankless heaters come with their own pros and cons. If you are still confused about whether you should get them or not, then weighing their advantages and disadvantages may be able to help you understand why you should choose them and how they can make your life comfortable.

Here are plenty of pros and cons of a tankless heater that you should bear in mind before making a purchase.

Money-Saving Option

Many folks switch from a standard heater to a tankless unit because it can support them save money on energy costs in the long run. It operates only when hot water is required, so users can save a considerable amount of energy. They can reduce energy bills by up to 35% to 95%.

Never Runs Out Of Hot Water

The worst thing about a tank water heater is that it has limited hot water storage capacity. It means once it runs out, you will have to take a shower or wash clothes with cold water.

However, on the other hand, tankless systems work differently and provide an unlimited stream of hot water faster. So, your family can enjoy a nonstop supply of warm water that never runs out.

Pure Water

They provide purer and outstanding quality of hot water for your usage. The tank-style unit can potentially build rust, upscale, and corrosion inside it over time. It means there are higher chances of you getting impure and rustier water.

However, if you will use the tankless heater, you won’t have to experience this problem. It provides fresh and cleaner hot water all the time.


The best tankless water heater scores higher in terms of safety. It operates only when hot water is needed, so there is no hazard of overheating or explosion. The tank-style units are always turned on, so they are prone to wear and tear.

The on-demand heaters feature cutting-edge safety-enhancing functions including temperature controls and flow monitors. They automatically shut off in case of system failure.

Limitless Hot Water

If you live in a cold area where hot water is mandatory for your survival, then it’s highly recommended to opt for the best tankless water heater because it allows you to obtain limitless hot water in several outlets of fittings simultaneously.

You can be enjoying your Jacuzzi tub while the washing machine and dishwasher are operating simultaneously without having a fear of running out of warm water.


By design and functionality, they are more durable and designed to last for a longer period than standard hot water tanks. They arrive with warranties of 12 to 15 years and can last for at least 20 years.

However, the tank heaters have a warranty of 5 to 7 years only. You will have to swap two to three tank storage heaters before you can think about replacing a single tankless unit.

Can Be Installed Anywhere

On-demand water units have a compact size, so they don’t take too much space of your house. You can easily install them in any corner of the house without thinking too much.

They can be installed on the shelf, floor, or wall either inside or outside the house depending on the local weather.


High Upfront Costs

No doubt, they are designed to last longer and help people save a considerable amount on energy bills, but they have a higher initial cost than the traditional heaters.

Lag Time

It’s true that these units permit users to enjoy a continuous supply of hot water, but there may be small fluctuations and variations in the water supply. If more than one shower or sink is running at the same time, there will be a significant impact on the steadiness of hot water.

It’s A Luxury

These energy-efficient and environment-friendly heaters are great, but you won’t be able to witness savings on your utility expenditures for a few years.

High Installation Cost

The best gas condensing tankless water heater has a higher installation cost. Also, keep in mind that some models require venting as well.

People who live in places with hard water may need to deploy a water softener as well. Installing a water softener is imperative because hard water can severely damage the unit.

Frequently Asked Questions

Q. What Tankless Water Heater Do I Need?

First of all, determine the size of your apartment or organization. Then, compare your individual water needs to the capacity of the heater you want to purchase. While making a decision, keep in mind, how many people will be taking bath?
Is there a specific time when more people are taking a shower? How many dishwashers and washing machines are in use?
Do you want to utilize these machines at the same time when more people are taking a shower? Many families use appliances that consume warm water in time periods when no one is taking a bath or shower.
Do you have a bathtub, how frequently you use it, and what is its filling capacity? Do you use it at the same time when both dishwasher and washing machine are running?
You must be able to establish a flow estimate in gallons per minute. It can be done by including the flow rates of all faucets, showerheads, and different appliances.
Also, check the temperature rise of the groundwater in your state. The temperature rise of the incoming water should be between 41 to 105.5 degrees.
Then, evaluate if it can heat 5.1 gallons of hot water with that temperature rise or not. So, you will need a unit that can create 61 degrees Fahrenheit temperature rise at 5.3 gallons of hot water every minute.

Q. How To Install The Best Tankless Water Heater?

If you want to take advantage of the warranty, then it is highly recommended to employ the services of a licensed plumber or contractor.
The expert will take care of all basic standards including gas and water line size, ventilation, upgrading the wiring, circuit-breaker panel of an electric heater, and many other things.

Q. Can Tankless Water Heater Be Installed In Attic?

The answer to this query depends on your attic. You can fix it in any area of your house from a kitchen to bathroom, of course, in a dusty attic too. You can put it if there’s adequate combustion air provided.
However, plumbing pipes and natural gas are required that can easily reach the unit. Therefore, plumbers suggest placing it where the previous heater was positioned.

Q. Will Tankless Water Heater Work Without Electricity?

They don’t operate without electricity, be it is a gas or propane or electric-powered heater. All types of tankless units need an electricity supply to work. They are highly reliant on a PC board or digital remote to sense the flow rate of water.
Their sensors need electricity to activate the heating process. Moreover, many gas and propane-powered units use a direct electric ignition instead of using a standby pilot light.
Fortunately, many models utilize a typical power outlet. To prevent power surges or unpredicted system failure during hurricanes and storms, make sure to attach your heater to an alternative power source.
The electric units are 8% to 50% more energy-efficient than tank water storage heaters. A Propane or gas-powered best tankless water heater uses a nominal amount of energy. So, you can enjoy a constant hot water supply at an economical rate.
If you experience power outages in your area more often, then get in touch with a local plumber or contractor to discuss your options.
It can be installed in combination with other tankless heating systems that don’t need electricity to function such as Solar-powered water heater.
If you are looking for a water heating unit that doesn’t rely on electricity, then talk to a plumber about the best hot water heater for you.

Q. When To Service The Best Tankless Water Heater?

Maintaining a tankless heater is compulsory because it can help you boost the longevity of the unit. Heaters that are tuned to a higher temperature should be maintained twice a year.
Hard water is also an imperative reason that can lead your heater to repairs, but regular maintenance not only reduces the effects of hard water but promotes energy efficiency as well.
Hard water is filled with minerals, mostly calcium and magnesium that can accumulate inside the heat exchanger. With the passage of time, minerals will block the paths where the water flows that will have a negative impact on water flow speed.
If you will not clean the heat exchanger frequently, it can reduce your tankless heater’s lifespan. Hard water forces your unit to work harder to supply hot water constantly. It can cause your electricity expenses to skyrocket.
Additionally, the mineral accumulation in different components of the system can cause irreparable damage that can lead to the entire unit replacement.
It is highly recommended to hire professional maintenance service, but if you can’t afford it, you can do it yourself. If the mineral has buildup in your unit, you can flush it with a solution or vinegar. You can also install an inline filter to reduce lime buildup.
These steps can help your heater to work with maximum efficiency and decrease energy bills. They can also diminish unnecessary wear and tear that can help your system to last for more than 15 years.

Q. Is It Necessary To Clean Tankless Water Heater?

It is critical to clean it frequently to prevent the buildup and growth of bacteria. All types of water units have different cleaning requirements.
So, before starting the cleaning process, make sure to read the user’s manual, and follow the instructions. You can clean it with white vinegar but some models can be cleaned with cleaning solutions as well.

Q. Will Best Tankless Water Heater Save Money?

The short and sweet answer to this inquiry is “YES”. If you are using a tank-style heater and sick of paying a hefty energy bill every month, then, you should definitely switch to a tankless unit.
It has a higher initial cost, but in the long run, it can help you save a lot of money. According to consumer reports, your savings can be around $75 to $100 per year.

Q. Where To Buy Tankless Water Heater?

You can easily find all models sizes at reputed plumbing-supply and big-box stores. If you want, you can also order them online but make sure to recite the specifications to avoid problems later.

Q. What Brand Of Tankless Water Heater Is Best?

These are the leading brands that produce tankless heaters:
• Rinnai
• Rheem
• Takagi
• Stiebel Eltron
• Ecosmart

Q. What Is The Downside Of A Tankless Water Heater?

When you run the dishwasher and shower at the same time, you can run out of water. They need a large amount of energy to start generating warm water. The units are expensive and also have a higher installation cost.

Q. Is The Tankless Water Heater Worth It?

They provide unlimited and instant hot water and have a longer life. They help you save money on power and water bills. The compressed size enables you to save space in the house. It eliminates standby heat loss, and you never run out of water with them. Both gas and electric units feature more extended warranties.

Q. What Size Tankless Water Heater Do I Need For A Family Of 5?

You need a 10 GPM unit if you are situated in a colder country where the input water temperature is low.

Q. Which Is Better Tank Or Tankless Hot Water Heater?

Tankless heaters are better than tank-style units because they provide you constant and limitless hot water. They don’t have a tank, so they don’t store the water. You get water only when you turn on the tap. It does not use energy when it is not working and has a longer lifespan.

Q. Do You Run Out Of Hot Water With A Tankless Water Heater?

If you have a medium-sized family, and want to run multiple applications simultaneously, get a larger sized heater to never run out of water. However, if you obtain a small unit and run numerous applications at once, you will run out of water.


There are numerous tankless water units obtainable in the market and online. Traditional water units can’t compete with tankless systems because they are more ecological and offer more amenities.
Aside from being sustainable, they support you save money and make your life warmer. The prices of all brands may vary extensively; this is due to their splendid service and reputation.
Always make sure to go through customer reviews before taking the dive.

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