There are a wide variety of gas tankless water heaters currently available. With options like interior only varieties and portable units, it can be difficult finding the best gas tankless water heater for you. In our article, we’re going to be covering 10 of the best models available online. In addition, we will also have a buyer’s guide section that contains valuable information to help you with the buying process.
Best Gas Tankless Water Heater Comparison Table
|Rinnai RUC98iN||Residential &|
|Rinnai RL75iN||Residential &|
|Rheem RTG-64DVLN||Residential||Natural Gas||Indoor|
|Takagi T-KJr2-IN-NG||Residential||Natural Gas||Indoor|
|Noritz NRC661-DV-NG||Small Homes||Natural Gas||Indoor|
|Takagi T-KJr2-IN-LP||Light Residential||Propane||Indoor|
|Takagi T-KJr2-OS-NG||Light Residential||Natural Gas||Outdoor|
|Camp Chef Triton||Camping||Propane||Outdoor|
Reviews of Gas Tankless Water Heaters
Rinnai RUC98iN – Best Residential Tankless Gas Water Heater
For larger-scale applications, the Rinnai RUC98iN model is one of the best residential tankless gas water heaters available. With plenty of useful features, it earned its spot on our list with virtually no effort.
To begin with, we really like that this model meets ultra low NOx emission standards. With a 95 percent energy efficiency rating, it quickly produces hot water with ease. In addition, the heat exchanger portion of the unit is covered by a 12-year warranty from the manufacturer. The expanded temperature range of this model is also a nice feature that many users will find helpful as well.
With all of the positive things we found, we still found one thing we were not happy with. Unfortunately, the purchase price of this model is quite a bit higher than many of the other options on our list. However, this is partly due to the extra hot water output capacity that this model can produce.
Rinnai RL75iN – Best Natural Gas Water Heater
Built for some of the largest homes, the Rinnai RL75iN has one of the highest flow-rates of any product on our list. In addition to its expanded output potential, it has many other useful features that make it a great option to consider.
One of the things that we found particularly helpful with this model is that the display and controls are very easy to use. With a digital temperature display and a simple arrow layout, changing the water temperature only takes moments with this model. In addition, this water heater is compatible with commercial controllers for even higher temperature settings.
While there is plenty to like with this particular model, we weren’t too happy with the energy efficiency level. Compared to other similar models, the energy efficiency level is a bit lower. However, this may be due to the extra flow rate that it provides.
Rheem RTGH-84DVLN – Best Gas Tankless Water Heater With Freeze Protection
For areas where freezing temperatures are a cause for concern, you may want to consider the Rheem RTGH-84DVLN model. With a built-in blower, this model is capable of withstanding freezing temperatures of up to -30 degrees Fahrenheit.
Besides the built-in freeze protection, we also like that this model utilizes an environmentally friendly low-NOx burner. With a minimum flow rate of only .26 GPM, this product activates easily in even smaller home designs. In addition, it features EZ-Link cables that support additional tankless heater connections for expanded capacity.
With all of the useful features this model provides, we were hard-pressed to find a negative side. The only problem we found is that this unit uses a bit more energy that some of the other heaters on our list. However, this is slightly expected since it comes with built-in freeze protection.
Takagi T-KJr2-IN-NG – Best Indoor Gas Tankless Water Heater
For a combination of reasons, we feel that the Takagi T-KJr2-IN-NG is an excellent product that many consumers will be happy with. With tons of features, this product fits nicely in most standard residential settings.
One of the best features that this model has is an impress 6.6 GPM flow-rate. Besides providing more than enough water for smaller family sizes, this model is also quite compact as well. This helps expand the range of spaces that it can be installed in and simplifies the installation process as well.
While we did find a lot of useful features in this model, we did also find one negative element as well. For larger applications, the heating capacity of this model tends to fall off. For best results, you likely want to avoid using this model with more than three people in a home.
Noritz NRC661-DV-NG – Best Quality Gas Tankless Water Heater
For many individuals, the Noritz NRC661-DV-NG model is often regarded as one of the best quality tankless water heaters available. Based on our research, we would have to agree with this assessment.
One of the biggest features we like about this particular product is that it can be vented with standard PVC pipe fitting. This helps cut down on installation costs slightly and simplifies the installation process a bit. As for construction quality, the exterior of the product is finished with a rust-resistant paint that is easy to wipe down and care for. In northern climates, this model produces enough hot water for one a half baths.
Though we do like many of the features we found on this product, we found one area where it falls behind many other models. Based on our research the temperature control mechanism for this model is harder to use.
Takagi T-KJr2-IN-LP – Best Price Tankless Gas Water Heater
For those of you who are concerned about price, the Takagi T-KJr2-IN-LP model may be the best choice for you. In addition to its affordable nature, we found many other useful features that make it an excellent product.
For starters, this model has a reliable 6.6 GPM flow capacity that is ideal for most small homes and condominiums. We also like that this product is very lightweight weighing in at only 37.8 pounds. The exterior of this model is finished with a glossy paint that is easy to wipe down occasionally and requires only minimal amounts of maintenance.
Designed specifically for smaller homes and condominiums, we were saddened to see that this model requires stainless steel venting. This can slightly complicate the installation process and often cost significantly more than PVC venting types.
Takagi T-KJr2-OS-NG – Best Affordable Gas Tankless Water Heater For The Outdoors
For homeowners who prefer outdoor installations, the Takagi T-KJr2-OS-NG model is one of the most affordable options available. In addition to its low purchase price, it has many other useful features that make it an excellent choice.
Much like its sister models, this product sports a space-saving design that makes it an ideal choice for small-scale application use. With a 6.6 GPM flow-rate, this model produces enough hot water for most standard small apartment design. In addition, it has built-in freeze protection as well for enhanced durability.
Unfortunately, this model suffers from the same problem as other water heaters in the same product line. Due to its small size, this model is not suitable for larger homes. However, this is offset by its really low cost and other useful features.
Camplux 16L – Best Outdoor Tankless Gas Water Heater
Built specifically for the outdoors and traveling, the Camplux 16L model is worth looking at. In addition to its portability, it has many other useful features that make it a great choice for many consumers.
One of the best things we like about this product is that it comes with all of the adapters and screws you need to set it up easily. It even includes its own shower head for added convenience as well. With a thermal efficiency rating of 88.5 percent, this model is also a great choice for users who are concerned about the environment.
With all of the useful things we like about this model, there is one drawback that users should be aware of. This product is designed for light applications only. It’s basically an excellent product to take with you on camping trips and for utility purposes like washing livestock down. The hot water output is not enough for even the smallest standard home sizes.
Camp Chef Triton – Best Portable Tankless Gas Water Heater
Weighing in at less than 30 pounds, the Camp Chef Triton model is one of the most portable tankless water heaters on our list. With plenty of positive features, it’s an excellent option for many users to consider for their hot water heating needs.
Continuing on the subject of portability, another useful feature that we like with this particular product is the carrying handle at the top of the unit. This simplifies transport and is very convenient. In addition, this small unit is able to produce hot water at rates of up to 2.6 GPM. This is more than sufficient for simple showering and bathing needs.
While this unit may indeed be very portable, it’s important that you recognize its limitations. This product is mainly designed for use while camping and other small-scale outdoor projects. It is not a suitable choice for full-scale use in residences and commercial properties.
Costway – Best Battery-powered Tankless Gas Water Heater
Costway is another great brand that is designed specifically for wilderness enthusiasts and outdoor adventures in general. Combining portability and dependability, this water heater is extremely easy to use and set up for most individuals.
As far as features go, we love that this model is powered by a standard 12-volt battery. For extended use, it can be connected via the charging adapter to your car to provide virtually limitless operation in the wilderness. In addition, this model comes with a shower hose and shower attachment for added convenience as well.
Much like the product before, the biggest downside we found with this product is its limited use in residential settings. Keep in mind that this product is only designed for short-term use during camping trips and other outdoor activities. As long as you understand its limitations, you will likely be satisfied with this product.
Best Gas Tankless Water Heater Buyer’s Guide
How To Pick The Right Model For You
When shopping for the best tankless gas water heater, there are a variety of factors that you need to consider carefully before deciding on the best option for you and your family. In our best tankless gas water heater buyer’s guide, we’re going to be reviewing some of those factors in greater detail to help you make the best purchasing decision possible.
The first and most important factor you should take into account when searching for tankless water heaters is their total heating capacity.
Unlike traditional water heaters, tankless models do not store water in a metal drum. Instead, they heat water at a constant rate as it is being used throughout the home.
With this in mind, tankless water heaters are rated at a given flow-rate based on their total output using GPM. GPM is short for gallons per minute and directly translates to the amount of heated water your heater can output at one time.
Using the numbers you just wrote down, go ahead and add up all of the water sources that you regularly use at the same time. A good combination to consider using is the total flow-rate of your dishwasher, shower fixture, and dishwasher. This number is the total GPM that your hot water heater likely needs to be able to handle to provide an uninterrupted supply of hot water.
The next step involves calculating the average temperature rise necessary to achieve your target hot water temperature. In colder areas, the temperature rise will be significantly greater. The higher the temperature rise, the lower the total GPM output will be for your hot water heater. Make sure you are looking at the correct GPM rating level that correlates to the necessary temperature rise to avoid undersizing your water heater.
Portability and Size
Portability and size is another area that you should focus on when searching for the best tankless water heater for your needs. With several of the options on our list, they are intended for smaller scale use for things like backpacking, camping, and washing down livestock. We took the time to specify which units fall into this category to avoid any potential confusion.
With those models, they do not support the required GPM rating for typical residential and commercial scale use. However, they are extremely easy to set up and usually don’t require any special electrical wiring. In addition, they can be stored away easily in a typical garage when you’re done using them.
For the full-sized models, the size of the unit can have a major impact on the installation process. Many of the smaller units are designed to be extra compact and are ideal for smaller spaces that are commonly seen in condominiums and townhomes.
Before purchasing a tankless water heater, it’s a good idea to measure the area where it is likely to be installed.
Using these measurements, you can get a good idea as to what size tankless water heater will fit in the given space.
Natural Gas or Propane?
With tankless water heaters, they are mainly designed for use with natural gas. However, many of the models come with special adapters that can be used to convert them to propane as well. When shopping for tankless water heaters, it’s important to know what type of gas source you plan on using beforehand.
Make sure that you’re purchasing a tankless water heater that is compatible with the fuel source you plan on using.
When in doubt, it’s always best to contact the manufacturer directly to make sure the given model is compatible with your preferred fuel source.
Think About Wiring
With many of the available tankless water heaters on our list, they are powered via a simple battery that is very easy to occasionally replace. These models are usually much more compact and are simpler to install. However, many of the more advanced models can require significant amounts of specialized electrical wiring for proper installation.
This type of wiring may require an update to your breaker box that will have to be carried out by a licensed electrician.
Tankless water heaters that have anti-freezing mechanisms are very likely to fall into this category. In addition, the versions that have LCD displays also frequently require a dedicated electrical connection as well.
Don’t Forget Ventilation
When purchasing an indoor gas tankless water heater, you will almost always have to have a dedicated ventilation pipe installed. For the majority of full-sized models, this means that you will have to invest in steel ventilation piping. Unfortunately, this can prove to be a bit more difficult to install and is often much more expensive.
If you want to avoid venting altogether, your best bet may be a tankless water heater that is designed for exterior mounting. These types of products are much easier to install since they require no specialized venting. However, they are much more susceptible to outdoor conditions like freezing temperatures and more. In addition, having your water pipe located outside your home can increase the temperature rise level needed for the heater to work correctly.
With just a bit of prior planning and research on your part, you can easily find the best gas tankless water heater for your home. By following the information outlined in our buyer’s guide, you should be well on your way to finding the perfect water heater to fulfill your family’s needs.