Best Gas Tankless Water Heater [Natural Gas] – Review & Buyer’s Guide 2022

If you are tired of rising prices of energy or not acquiring adequate warm water when you need it the most, you should get the best gas tankless water heater because it can lower your energy expenditures by 30% to 40%.

They are a valuable investment based on their convenience and financial savings.

Besides, their environment-friendliness, first-class performance, and energy efficiency only sweeten the bargain.

The best natural gas tankless water heater performs better in cold weather and has lower fuel prices compared to electric heaters. In the long run, they are more dependable.

To obtain the full assortment of benefits, it is critical to pick the correct device for your property’s particular requirements.

The market is overloaded with options and it is tremendously easy to get an inappropriate unit for your needs. That’s why; we have prepared a list of top rated gas tankless water heater for you.

We have considered all the details, both good and bad, and gathered them into an in-depth guide that will assist you to decide which machine is worth your investment.

What Is A Gas Tankless Water Heater?

A gas heater runs on natural gas and does not have a container to store water.

In the past, tank technology was utilized and water was heated indirectly and reserved in a boiler for later usage.

Logically, traditional water heating machines would run out of water speedily—depending on the demand for hot water in the house or office—and you would have to wait for the unit to warm the cold water and fill the container again.

Tankless appliances, on the other hand, are capable of supplying a household with instant, on-demand hot water. Basically, they heat water when you turn on the fixture.

Some devices will indeed require you to wait for some time before being delivered with perfectly warm water, but it is reliant on how competent your machine is.

Most models can heat water instantly, whereas some models can take up to 30 seconds to 2 minutes before providing you with hot water.  

How Does The Best Gas Tankless Water Heater For Large Home Work?

Gas units are significantly more energy-smart than standard heaters and tankless electric models.

A traditional tank-style device consumes a lot of electricity or gas to keep the water in the boiler hot.

It carries on to do this even when you are not using the water—which fallouts in standby heat and money loss.

They have burners at the boiler’s bottom which then heat the water.

Though tankless gas tanks also take advantage of burners, they work in a totally different way.

When you activate the faucet in your residence, cold water will start to travel through the device.

As the water travels, a flow sensor triggers the burners. These will then continue to heat the heat exchanger.

The cold water entering the device encircles the heat exchanger. The heat exchanger, in turn, heats the water promptly before it leaves the appliance.

Gas tankless machines are armed with a sealed vent system to permit the combustion vapors to disperse safely.

The best gas tankless water heater 2021 generates a higher flow rate than electric heaters. However, they are not without imperfections.

They can sometimes struggle to keep up with a high demand for warm water.

For instance, if a shower and a dishwasher are running at the same time, it might not be able to keep up.

Hence, if your residence needs the concurrent usage of hot water from multiple taps, you might need multiple units.

Furthermore, these models are quite expensive compared to standard heaters.

Nonetheless, they are affordable to use in the long run because your yearly electricity and water bills will reduce significantly.

What Are The Types Of Top Rated Tankless Gas Water Heater?

It has five types that are as follows:

Indoor Gas Tankless Water Heater

They are deployed identically as a traditional tank-style device. The only difference is that they are without a tank.

They are normally installed on the wall in a place that offers great venting. It is an excellent choice for those who live in the coldest countries.

Deploying the device indoors can inhibit any freezing damage to the pipes and heater.

In addition to that, they produce a considerable amount of condensation while operating.

That’s why; they need a proper drainage system to prevent water damages.  

Outdoor Gas Tankless Water Heater

These appliances are typically elected when ventilation is complicated or impossible to deploy. It is simply installed on your house’s exterior instead of inside.

If you thinking about replacing your broken tank water heater, you should give a shot to the outdoor unit because you won’t have to make as many alterations to your residence.

Non-Condensing Gas Tankless Water Heater

They heat water on-demand with a heat exchanger and are 85% energy-efficient.

This proven technology has been used in Europe and Japan for many years.

Their biggest advantage is that they are very dependable because they are established items and have few to zero engineering problems.

However, they do have some flaws. For instance, the exhaust gets extremely hot, so you will have to deploy extra stainless steel vents that will lower the energy efficiency.

Condensing Gas Tankless Water Heaters

These machines are known as the 2nd generation of tankless appliances.

They rely on a secondary heat exchanger after their primary heat exchanger.

The 2nd one reutilizes the heat from the exhaust to warm the water even more.

So, their energy efficiency rating is up to 94%. Their major advantage is that you can vent them using PVC pipes.

Besides, their disadvantage is that they are very costly.  

Condensing Hybrid Gas Tankless Water Heater

The best gas tankless water heater features a tiny water storage tank—typically up to 2 gallons.

This container stores the hot water and eliminates the efficiency lost for short draws. So, their energy efficiency rating is 96%.

According to research, these machines can constantly work at 94% efficiency with no abasement instigated by short draws.

Furthermore, you can vent them with PVC, so they are cost-effective.

However, as condensing hybrid is a newer technology, thus, they are crafted by small manufacturers.

It results in warranty and engineering-quality issues.

10 Best Gas Tankless Water Heater For Cold Climates

1. Rinnai RU199iN RRU199iN – Best Overall

Rinnai RU199iN RRU199iN is popular among consumers because of its high flow rate.

It features a maximum flow rate of 11 GPM which is practically the highest in the category.

However, the flow rate depends on the incoming water force.

With such a high flow rate, you can effortlessly configure your residence with several fixtures.

Moreover, it allows you to run two showers simultaneously.

This best tankless water heater natural gas has a simple mechanism that consists of a fast heating option.

It comes with minimum consumption of 15000 BTU units and maximum consumption of 199000 BTU units.

Because of the high consumption of BTU units, it performs with uninterrupted support.

It means you will get nonstop hot water for your property.

Circ-logic technology is integrated into it, which is similar to water recirculation. Hence, there is no water loss.

It has a 40-gallon container, so you would think that it is a large heater.

However, it boasts a compact and space-saving design.

Furthermore, its maximum length is 31 inches and its total weight is 64 pounds.

Specifications:

2. Rinnai Tankless Hot Water Heater V75IN

Rinnai is a leading water heater company that has shown unique determination about its indoor water heaters.

With their V75IN model, they strive to satisfy the specific needs of their consumers.

It is a 0.32-ounce appliance that measures just 14 x 9 x 23 inches and is equipped with multiple features that make it stand out among competitors.

First of all, if we talk about its design, it features a compact and sleek design, so you can mount it at any place you want.

Its neat white look will grab everyone’s attention instantly.

Its small size ensures that you not only have sufficient storage space, it also ensures that you have hot water on demand.

It is an extraordinary option for a medium-sized house.

In this best on-demand water heater gas, the brand has used a direct concentric venting system, which is coupled with a closed combustion system.

We are also impressed by its stunning performance.

Its output is rated at 180000 BTUs and its flow rate is 7.5 GPM.

With this handsome flow rate, it can meet all your house’s hot water needs.

Besides, its energy factor is 0.82, so its performance is optimized.

This superior quality unit also has a built-in temperature controller that allows you to set the temperature according to your needs.

The clean gas combustion attained through propane or gas subsidies to its overall performance.

Eco-gas burner also plays a significant role in increasing its performance. Also, it ensures that there are low NOx emissions.

Specifications:

3. Rinnai RU160iN RRU160iN

Rinnai Ru160in is the most prevalent water heater currently available in the industry. It is armed with all the first-rate features you can imagine.

It comes with a modern-looking, sleek, and compact design, so it will save space in your house.

It is specifically designed for mobile homes and trailers.

This best gas tankless water heater 2021 can be installed at high altitudes up to 10,200 feet.

Furthermore, it has a whopping 95% energy efficiency rating, which is more than impressive for a gas-fired unit.

Its energy factor rating is 0.95 and its uniform energy factor is 0.93.

Best of all, it is a certified “energy star” water heater.

Ru160in relies on double heat exchangers that are constructed of stainless steel.

Stainless steel heat exchangers’ super thermal conductivity boosts energy efficiency and corrosion resistance.

This tankless water heater collects heat from the burner and heats exhaust gas. This is why; it requires two heat exchangers.

The first heat exchanger interchanges heat from a fiber mesh premix burner to the groundwater.

The secondary heat exchanger collects heat from the escaping hot exhaust gas, so it lessens energy wastage to offer heightened efficiency.

Specifications:

4. Rinnai RU130iN RRU130iN

The RU130iN RRU130iN is also manufactured by the world-famous Rinnai brand.

Just like other Rinnai products, this best gas tankless water heater whole house is also energy star-certified and is exclusively designed to recapture.

It reutilizes exhaust gas for ideal energy efficiency.

Moreover, it can produce 7 GPM, which is adequate to run two low-flow showers and the dishwasher at the same time in warmer areas.

In colder regions with incoming water temperatures around 50 degrees, it can create perfectly warm water for two showers simultaneously.

If you run it at 4 GPM, it will cost you approximately $133 annually.

You can install this brisk compact device indoors only.

It helps you save up to 16 inches of space compared to a standard water heater.

On top of everything else, it is compatible with both gas and propane and it guarantees that neither water nor gas goes to waste.

The brand has made it viable with the Circ-logic technology that satisfies your needs faster according to your scheduled patterns.

If you want to install this tankless machine yourself, you should seek comprehensive information on the deployment details.

The guidelines on the user manual may give specifications on the gas flow pressure, flow rate, etc.

You should apply the control settings only after the successful deployment.

This unit does not offer WIFI capabilities; you can include them by purchasing the control R WIFI module.

Once installed, the brand’s smartphone application permits you to control your appliance’s temperature and obtain maintenance alerts.

Furthermore, it also allows you to turn on the recirculation system with the application.  

Specifications:

5. Rinnai RL94EN RRL94eN

If you don’t want to deal with venting, you should look out for an outdoor tankless device.

If you are located in a region where the temperature drops below freezing point occasionally, you can buy Rinnai RL94EN as it is equipped with a freeze protection system.

This high-quality unit creates 9.4 GPM, so if you have a family of 5, it is an outstanding option for you.

This generous flow rate allows you to run several faucets in three bathrooms and never witness a drop in the temperature.

With a 0.4 GPM startup trigger setting, you can run low-flow faucets as well.

On the other hand, folks who live in warm climates will acquire the max GPM.

The energy efficiency rating of the best natural gas tankless water heater is 83%, so you can be sure that you won’t have to pay heavy electricity bills.

This incredible machine pays for itself in less than 5 years with 30% savings on your monthly gas bills.

Since it is an outdoor device, so its deployment is a snap.

If you are comfortable with installing it yourself, it should not cause any problems.

However, you will have to be careful when it comes to pressure.

It needs to have 5WC (minimum) and 10WC (maximum).

Another noteworthy feature of it is that it is super-easy to use.

We love that it is WIFI capable. It means you can set up your cellphone to control its settings and make modifications by just clicking a button.

If you feel the temperature is too high, simply decrease it and if you want to increase it later, set it to your preference without needing to use the control panel.

You will obtain a 10-foot wire with this appliance that will attach it to the LED screen that you can then put in your residence so you don’t have to go outdoors to alter it if you are not using the internet.  

Specifications:

6. Noritz NRC66DVNG Indoor

Noritz NRC66DVNG is a top rated tankless gas water heater that weighs only 39 pounds.

Thus, it is extremely lightweight and you can carry it easily when you are wall mounting it for your usage.

It features a superb propane and gas fuel system.

The emission is minimal due to carbon reduction technology. So, it is safe for indoor use.

What we like the most about this machine is its efficiency.

It consumes 120000 BTU units, so it is a really good device for regular use for a medium-sized family.

This unit offers an impressive flow rate of 6.6 GPM. It means you will forever obtain a reasonable quantity of water pressure appropriate for daily use.

Another biggest advantage of it is that it is thoroughly controlled by electricity.

Therefore, you won’t have to deal with gas ignition.

Furthermore, its exterior electronic control pad lets you manually fine-tune the water temperature to your preferred level.

You have to connect this best gas tankless water heater to its own dedicated 110v outlet for the controls to work correctly.

With a temp range of 100° to 140°, you can control the heat level in your house easily.

Specifications:

7. Takagi T-H3-DV-N

The Takagi T-H3-DV-N has the capability to generate 10 gallons of water per minute, so it is an extraordinary option for medium and large houses where numerous taps are used at the same time.

This indoor condensing gas-powered water heater has high thermal and energy competence.

Due to its condensing ability, it functions quietly; therefore, it is an excellent choice for folks who want a peaceful environment.

Furthermore, it features a very low NOx emission rate and a self-modulating heating mechanism.

The gas inputs of this reliable machine are 199000 BTUs and the energy factor is 0.85, making it the most energy-efficient water heater.

Its dimensions are 11.2 x 17.8 x 24.9 inches, so it has also earned the title of “the smallest tankless appliance” in its price range.

The compact size makes its deployment very easy and hassle-free.

Along with that, this durable and long-lasting water heater has a 15 years limited warranty for residential models and 10 years guarantee for commercial models.

Besides, the brand has offered 5 years warranty for parts. This best tankless water heater natural gas needs a special venting and pipe system as well as expert deployment, which can be quite costly.  

Specifications:

8. Eccotemp i12-NG Tankless Water Heater

Whenever you buy a new gadget, your friends and family want to play with it.

The same rule applies even if you are getting a new tankless unit.

With the Eccotemp i12-NG heater, you can keep the snooping hands away from modifying your water supply’s temperature.

It is armed with child-lock technology, which is rarely seen in the market, delivering you with a protected warm water experience.

This high-quality and affordable device comes with a 1/2-inch NPT water fitting, so you won’t have to worry about changing to 3/4-inch connections.

Its temperature controls are completely automatic, which means you can set your desired temperature on the small digital display and the heater performs the rest of the work for you.

The company has utilized a black acrylic glass casing instead of a metal casing to keep the weight light without compromising safety.

It uses 2 watts when idling, so it is an energy-smart unit.

On the flip side, the weight of this best gas tankless water heater whole house is just 30 pounds, so you can install it in tighter spaces easily.

Best of all, it comes with stainless steel vent kit that you need for this appliance.

If you own a small house, cabin, or RV that you use for an annual holiday, it is a solid choice for you.

It creates approximately 3 GPM, thus, it can facilitate up to 2 fixtures at once.

While working, it uses only 0.7 amps, so it is not electricity monopolize like so many water heaters available in the industry today.

Specifications:

9. MAREY GA24CSANG 8.34GPM

The MAREY GA24CSANG 8.34GPM is an outstanding indoor solution for small households.
It has a maximum input rating of 170000 BTU and a flow rate of 8.4 GPM.
That’s why; this appliance is perfect for any size home, apartment, office, and RV.

Additionally, its modern design will hold everyone’s attention.

The brand has integrated a computerized safety system, flame failure protection, anti-freeze protection, and many other safety systems in it to ensure your and your property’s safety.

Moreover, it is CSA certified for the American and Canadian markets.

We like it because it does not need a pilot light and consumes no natural gas when the heater is idle.

The sleek and compact design of this best gas tankless water heater 2021 permits installation almost everywhere in the residence.

However, it must be mounted by a specialized plumber or electrician to guarantee safety and quality.

Specifications:

10. Rheem RTGH-95DVLN 9.5 GPM

If you are hunting for a beast gas tankless device, invest your hard-earned money on Rheem RTGH-95DVLN 9.5 GPM blindfolded.

With this beauty, you get a high flow rate of 9.5 GPM, which means you can run a dishwasher, two showers, do laundry, and wash utensils—all at once.

It has an enormous output capacity and it utilizes electricity very cautiously.

This condensing machine is one of the most energy-efficient options in the market.

Power and efficiency come at a price that will make it unaffordable for some people, but if you never want to run out of hot water, this is a remarkable investment.

This lightweight unit is very easy to mount on the wall, operates quickly and silently, and can compete with any traditional water heater in its performance and flow departments.

Rheem RTGH-95DVLN 9.5 GPM is highly suitable for small, medium, and big houses with a high demand for warm water.

We loved it because it is not frightened by the coldest climates.

If price is not an issue for you, this is the water heater you need, unquestionably.

Specifications:

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How To Select The Best Gas Tankless Water Heater For Cold Climates?

To look for the right device for your needs, you have to consider these things:

Gallons Per Minute

We are damn sure that you would never want to run out of hot water, especially in winters.

Therefore, you should find a suitable device with appropriate gallons per minute ratio that will guarantee continuous warm water flow.

Fuel Type

You have to choose between propane and natural gas.

Propone is the best option since it utilizes less energy and has less NOx emissions rate than electric and gas machines.

Warranty 

Your gas unit should be backed up by a proper warranty with the brand assisting you whenever a glitch occurs.

Be cautious. Nevertheless, some manufacturers provide extended warranties only if you employ a certified plumber to deploy the system.

Venting

Most gas tankless heaters use category 3 venting since it is created from stainless steel.

These tanks produce a considerable quantity of acidic condensation within the pipes.

Anti-Freeze Cold Safety 

The majority of devices deliver reliable services and computerized features for your safety.

They are exclusively designed for colder climates where temperatures reach freezing levels. Therefore, a good system should be armed with these protections.

Size

You can take into account the location which the unit needs when fixed to the wall.

Gas machines are larger compared to electric units—measuring 30X20-inch range due to the exhaust.

Energy Factor 

Energy factor must be determined before purchasing a heater.

According to the study, the energy factor provides more energy efficiency, which leads to low monthly functional expenses.

The heater’s energy efficiency rating should be more than 90%.  

Pros And Cons Of Best Natural Gas Tankless Water Heater