- 1 Gas Tankless Water Heater Reviews – Updated List
- 1.1 1. Takagi T-KJr2-IN-NG Indoor Tankless Gas Water Heater
- 1.2 2. Rheem RTGH-95DVLN Indoor Tankless Natural Gas Water Heater
- 1.3 3. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
- 1.4 4. Noritz NRC661-DV-NG Indoor Natural Gas Tankless Water Heater
- 1.5 5. MAREY Gas 10L Tankless Water Heater
- 1.6 6. Camplux 5L Outdoor Portable Propane Tankless Water Heater
- 1.7 7. Rinnai V65EP Outdoor Propane Tankless Water Heater
- 1.8 8 . Eccotemp i12-LP Indoor Propane Tankless Water Heater
- 1.9 9. Ridgeyard 12L Propane Gas Tankless Water Heater
- 1.10 10 . Eccotemp FVI-12 Indoor PropaneTankless Water Heater
- 2 Gas Tankless Water Heater Buying Guide:
- 3 Installation
- 4 Gas over Electric Tankless Water Heaters
- 5 Best Gas Tankless Water Heaters Comparison Chart
- 6 Conclusion
Today, due to their reliability, durability and relatively lower prices of gas, gas tankless water heaters remain very popular. Like other types of tankless water heaters, they provide you with instant hot water for as long as you need but on the plus side, they are known to have better performances in colder climates.
When making the choice for a new water heating system for your property, it is very important that you choose a product that will best meet your demand for hot water and while doing this, is efficient and economic. On the market there is a vast selection of the gas tankless water heater models, some of them working with natural gas and some with propane. However, to make it a piece of cake, we have again done all the research for you. Just read through our best gas tankless water heater reviews to make the best choice and then enjoy the endless hot water!
- Takagi T-KJr2-IN-NG Indoor Tankless Gas Water Heater
- PRICE $$$$
- Dimensions : 6.7 x 13.8 x 20.3"
- Weight : 38 pounds
- BTU : 140,000
- Max Water Flow Rate : 6.6 GPM
- Energy factor : 0.81-0.83
- Rheem RTGH-95DVLN Indoor Tankless Natural Gas Water Heater
- PRICE $$$$$
- Dimensions : 18.5 x 9.8 x 27.5"
- Weight : 82 pounds
- BTU : 199,000
- Max Water Flow Rate : 5 GPM
- Energy factor : 94 %
- Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
- PRICE $$$$$
- Dimensions : 10 x 18.5 x 26"
- Weight : 82 pounds
- BTU : 199,000
- Max Water Flow Rate : 9.8 GPM
- Energy factor : Up to 0.96
- Noritz NRC661-DV-NG Indoor Natural Gas Tankless Water Heater
- PRICE $$$$
- Dimensions : 6.7 x 13.8 x 23.6"
- Weight : 38 pounds
- BTU : 15,000 BTU to 120,000
- Max Water Flow Rate : 6.5 GPM
- Energy factor : 93 %
- MAREY Gas 10L Tankless Water Heater
- PRICE $$
- Dimensions : 28 x 16 x 9"
- Weight : 24 pounds
- BTU : N / A
- Max Water Flow Rate : 3.1 GPM
- Energy factor : 87 %
Gas Tankless Water Heater Reviews – Updated List
1. Takagi T-KJr2-IN-NG Indoor Tankless Gas Water Heater
Takagi T-KJr2-IN-NG is as good as a medium demand indoor tankless water heater that operates by gas gets! It is extremely popular among households of up to 5 people living in regions of fairly warm climates, which defines an average household in most of the country.
In warmer climates, with a maximum of 6.6 GPM, Takagi can supply hot water for three fixtures at once. In colder climates, this number drops to two, which still puts it one step ahead of many of the tankless water heaters on the market.
Takagi T-KJr2-IN-NG is well liked for its user-friendliness. As well as its easy and quick installation process, it is the smallest unit in the Takagi line-up. Also, there is a digital remote available separately. We can confidently say that the slight cost difference to buy it will be well worth your money for it will give you precise control over temperature.
Finally, if you are an environmentally conscious person, Takagi has been just built up for you! Available as working with natural gas or propane, Takagi is a very environment-friendly unit with its ultra-low NOx gas emission levels. In case you would like to learn more on Takagi, including its 10-year warranty details, read our buying guide now.
2. Rheem RTGH-95DVLN Indoor Tankless Natural Gas Water Heater
Are you living in a region with harsh winters where hot water is essential for a higher quality of life? Are you a person who demands a lot from their water heating systems? If so, we highly recommend that you check out Rheem RTGH-95DVLN Indoor Tankless Gas Water Heater.
With Rheem RTGH-95DVLN you will enjoy a flow rate of 9.5 gallons per minute which means that you can take a shower and run the washing machine while your son is hand washing the dishes and your daughter is taking a bath, all at the same time!
One specialty of this water heater is that the venting can be set both indoors and outdoors. Their special low-NOx system allows you to set it indoors, without any need for stainless steel vents. PVC vents will just do. Also, Rheem is very practical to use with its digital display and digital remote that comes with it
We believe Rheem RTGH-95DVLN is a perfect fit for larger households, even in colder climates. Go ahead and check our detailed review for never ending hot water pleasure!
3. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
Rinnai RUC98iN is a natural gas tankless water heater designed with advanced technologies to save homeowners time, money and space. With its 95% thermal efficiency, it takes water heating one step further with condensing technology that delivers more efficiency than ever before.
Rinnai is very easy to operate due to its digital display. Moreover, as well as controlling the temperature of the hot water coming out, it is possible to lock the temperature button to prevent unauthorized access.
This unit might be bigger and heavier than most of the other tankless water heaters, but you should note that it is also more powerful. With its flow rate of 9.8 gallons per minute, Rinnai RUC98iN can provide hot water for multiple showerheads and faucets at the same time.
If you do not ever want to prioritize scheduling hot water for your household activities, check out all the details of this amazing unit in our review!
4. Noritz NRC661-DV-NG Indoor Natural Gas Tankless Water Heater
If you are looking for a highly energy efficient and ultra-performing natural gas tankless water heater for your one-bathroom home, do not make a decision before considering Noritz NRC661-DV-NG.
Noritz NRC661 has an efficiency level of over 93% with its condensing technology that utilizes a dual heat exchanger. The unit comes with a small, integrated digital display on its front panel providing valuable information such as current water temperature, flow rate, and error codes in case of a failure. It also has an automatic ignition and a dual flame burner to prevent temperature fluctuations.
Noritz NRC661 is ideal for houses with up to two bathrooms. It will easily keep up with your needs with its quickness and efficiency in case you are living in such a house. Find out about Noritz NRC661’s long warranty of 12 years on the heat exchanger and many more in our detailed review.
5. MAREY Gas 10L Tankless Water Heater
If you are living in a one-bathroom house and will be satisfied with being able to wash the dishes or your clothes while your roommate is taking a shower, then Marey 10L tankless water heater is here to deliver!
Marey is small and light. Nonetheless, it is super powerful for a small to medium sized home with a water output of 3.1 gallons per minute. It is extremely energy efficient as it is triggered by water flow when the faucet is turned on, preventing all energy loss when not needed. Moreover, you do not need electricity at all to get this beast going! With its electric pulse ignition, all you will need to power Marey will be 2 D-cell batteries.
In addition to all its great features, Marey also comes with an anti-combustion and gas pressure safety protection, making it extra reliable. Furthermore, it is available with both natural gas and propane! To learn more about this portable, easy to use heater read our detailed review now!
- Camplux 5L Outdoor Portable Propane Tankless Water Heater
- PRICE $
- Dimensions : 11.4 x 5.5 x 14.6"
- Weight : 10.8 pounds
- BTU : 34,000
- Max Water Flow Rate : 1.32 GPM
- Energy factor : N / A
- Rinnai V65EP Outdoor Propane Tankless Water Heater
- PRICE $$$$
- Dimensions : 9 x 14 x 23"
- Weight : 60 pounds
- BTU : 150,000
- Max Water Flow Rate : 6.6 GPM
- Energy factor : 82 %
- Eccotemp i12-LP Indoor Propane Tankless Water Heater
- PRICE $$$
- Dimensions : 15 x 24 x 4"
- Weight : 29 pounds
- BTU : 25,000 - 80,000
- Max Water Flow Rate : 3 GPM
- Energy factor : 79 %
- Ridgeyard 12L Propane Gas Tankless Water Heater
- PRICE $
- Dimensions : 13.4 x 5.9 x 23.2"
- Weight : 22 pounds
- BTU : N / A
- Max Water Flow Rate : 3.2 GPM
- Energy factor : up to 60 %
- Eccotemp FVI-12 Indoor PropaneTankless Water Heater
- PRICE $$$
- Dimensions : 28 x 17 x 10.5"
- Weight : 29.4 pounds
- BTU : 74,500
- Max Water Flow Rate : 3.5 GPM
- Energy factor : 0.79
6. Camplux 5L Outdoor Portable Propane Tankless Water Heater
Are you an outdoors person? Do you like camping but also sailing? Would you like to enjoy hot water in your camping area as well as on your boat? Then Camplux 5L propane tankless water heater is just what you need! Camplux 5L has a very distinctive property: It is portable! This unit is so compact and lightweight that it is very easy to carry while traveling. Plus, it has a folding handle.
Another practical feature of Camplux 5L is that it is not dependent on electricity. To start it up all you need is 2 D-cell batteries. Moreover, it is extremely easy to set up and use.
Camplux boasts about having the lowest water pressure startup on the market. It only needs 2.5 PSI of water pressure to operate. In return, it has a water output of 1.32 GPM, which is not bad at all for a water heater of its size.
Read our detailed review for all the other juicy details of Camplux 5L and then enjoy hot water in your RV, boat, outdoor shower or while washing your pet in the garden!
7. Rinnai V65EP Outdoor Propane Tankless Water Heater
Would you like to indulge yourself with an endless supply of hot water without challenging your pockets? Well, if you are living in a two-bathroom house, Rinnai V65EP is just perfect for you! Rinnai V65EP produces 6.6 gallons of hot water per minute and has an 82% efficiency.
One of the most outstanding features of this unit is its enhanced scale detection system. With this system, you do not need to worry about any damage to the product prior to scale build up. Moreover, it has a temperature lock feature to avoid any temperature fluctuations.
It is important to note that Rinnai V65EP is certified for used in manufactured or mobile houses only. On one hand you may see this as a drawback but on the other hand, if you live in a mobile house it becomes a great advantage.
8 . Eccotemp i12-LP Indoor Propane Tankless Water Heater
Is design one of our priorities when choosing an appliance for your home? If so, we strongly recommend that you have a look at Eccotemp i12 tankless water heater. With its black tempered glass panel and LED display controls, it has a revolutionary design! In addition to its modern design, it also uses modern technology while operating. It features fully automatic temperature controls for precision, an energy saving mode, and child lock.
Eccotemp i12 will be a great whole-house water heating unit for smaller apartments with an average flow rate of 3 GPM. It comes with a stainless steel venting kit and a 2-year warranty on all parts. Check all the details for this user-friendly and highly energy efficient unit with an extremely sleek and modern design in our detailed review.
9. Ridgeyard 12L Propane Gas Tankless Water Heater
If you are in for endless hot water, we must mention that Ridgeyard tankless water heater, powered by liquid propane, will supply you with 12 L of hot water per minute with a 3.2 GPM of flow rate. So, if you are living in a one-bathroom house, it will be an endless source of hot water for you!
Ridgeyard comes with a showerhead for your bathroom and an overheat protection. This means it will automatically turn off over 167°F. It looks very modern with its stainless steel panel and LCD screen. It is very energy efficient, needing only 2 sets of 1.5V batteries to start up. Moreover, it has a very low water-pressure startup.
10 . Eccotemp FVI-12 Indoor PropaneTankless Water Heater
Are you living in a small house, a cabin or an apartment? Weighing only 20 pounds, Eccotemp FV-12 is just the perfect fit for your small habitat. It is extremely easy to set by means of its digital display. It runs on propane gas; however, needs electricity to run this digital display and its internal exhaust fan. The amount of electricity it consumes is fairly low, though. Its electricity consumption is around 2 watts when idle and around 10 watts when in use.
Eccotemp FVI-12 has a maximum flow rate of 4.8 GPM but for a 77 oF temperature rising its flow rate drops to 2.3 GPM, which is enough to run one showerhead and one faucet simultaneously. It comes with a stainless steel venting kit and in order to be able to use this kit, the unit needs to be installed on or near an exterior wall. Moreover, all of its parts, including the heat exchanger have 2-year warranties.
Eccotemp FV1-12 is a very compact and user-friendly tankless water heater. We believe that it is perfect for your small vacation cabin or your one-bathroom apartment.
Gas Tankless Water Heater Buying Guide:
How do gas tankless water heaters work?
A gas tankless water heater is a unit that uses a gas burner to heat water directly, without the use of a storage tank. The main principle of its operation includes heating water as it passes through its heat exchanger that is heated by a combustion reaction. But what is combustion? In a combustion reaction, the hydrogen content of the fuel is burned and as a result of this hot gases, also called combustion gases are produced. One of these gases produced is water vapor, also known as steam. At this point, depending on the type of your water heater, two different approaches are possible.
Condensing tankless water heaters have a second heat exchanger that uses the exhaust gases to heat the water. So, before the water goes into the main heat exchanger, it has already been heated to the desired temperature by being exposed to these warm gases. However, as heat is transferred from exhaust gases to the water, also water vapor or steam is produced. This steam turns into water as it cools down, which is known as condensation process. This condensation water is acidic, having a pH between 3 to 5 and it is very likely that it will corrode steel metals and other some other material.
Non-condensing tankless water heaters have vents that push out all the combustion gases, which will then cool down outside, not causing any condensation reaction inside the unit. So, they heat the water directly with the use of the gas burner. Actually, they lose around 20% of the heat to the outside through venting.
So, to sum up gas tankless water heaters work as follows:
- A hot water tap is turned on.
- A sensor detects the flow.
- The gas burner fires and the heat exchanger heats the flowing water.
- Condensing water heaters have a secondary heat exchanger that preheats the water, using heat from the exhaust gases.
- A thermostat modulates the amount of gas that goes to the burner, maintaining the pre-set temperature.
Condensing or Non-condensing?
We have learned the working principles of condensing and non-condensing tankless water heaters. Now it is time to ask which one is better… Let’s look into them, analyzing all the pros and cons;
- Condensing water heaters use the heat from the exhaust gases to heat the water as non-condensing units push them out through ventilation, which causes them to lose some heat with these exhaust gases. This makes non-condensing units around 20% less energy efficient.
- Non-condensing water heaters require special venting material because the temperature of the gases they push out may reach 300°F. The usual PVC type of simple vents that is used with condensing units cannot be used with them. Rather vents of more sustainable material such as stainless steel should be used, which is more expensive.
- Most non-condensing units are cheaper when purchasing.
- Most non-condensing units are smaller than condensing units, saving you more space.
- Non-condensing units require indoor combustion air whereas condensing units do not.
- Non-condensing water heaters require minimal maintenance. On the other hand, condensing water heaters require at least annual maintenance.
Natural Gas or Propane?
Propane and natural gas are two types of fuels that can be used for gas tankless water heaters. But what is the difference? Well, they are basically both fossil fuels. The main difference between them that concerns homeowners the most is that propane is compressed into a liquid form and is delivered to homes via a truck where a permanent propane tank should be located. However, natural gas remains in its gas state and is delivered to homes via pipelines.
When the two are compared, the main concern is, of course, the price. Like all fuels, their prices tend to fluctuate in time. Natural gas rates are measured in price per cubic foot since it is in the gas state, whereas propane rates are measured in price per gallon because it is in the liquid state. When you convert between units and compare average rates, it may seem that natural gas is the cheaper choice. However, the real value depends very much on where you live and the efficiency of your appliances. Moreover, the heating efficiency of propane is measured to be higher than natural gas which means that even if you are paying a higher price for propane on a per-unit basis, you will use less fuel to heat water because of its higher efficiency.
Before you start installing your gas tankless water heater appliance remember that they usually require gas supply lines with larger diameters and larger diameter exhaust systems.
- Turn off the main incoming water line to the house.
- Determine the location best suited for your new water heater.
- Mount the appliance on the wall according to the manufacturer’s instructions. Make sure that you have appropriately supported its weight
- Install ventilation ducting.
- Hook up the water supply line.
- Hook up a gas supply line from the stub on the wall to the water heater. Open the valve so that the handle is in the same direction as the line.
- Light the pilot on the gas water heater, following manufacturer’s directions.
- Enjoy the hot water!
Gas over Electric Tankless Water Heaters
Gas tankless water heaters, in general;
- have higher flow rate capacities
- have higher heating abilities
- are more energy efficient
- are less expensive
- operate better in colder climates.
So, if you have a large family that lives in a colder climate and want a whole house water heating system, we strongly recommend that you go for a gas tankless water heater instead of an electric tankless water heater.
Best Gas Tankless Water Heaters Comparison Chart
|PRODUCT||PRICE||DIMENSIONS||WEIGHT||BTU||MAX FLOW RATE||ENERGY FACTOR|
|Takagi T-KJr2-IN-NG Indoor Tankless Gas Water Heater||$$$$||6.7 x 13.8 x 20.3"||38 pounds||140,000||6.6 GPM||0.81-0.83|
|Rheem RTGH-95DVLN Indoor Tankless Natural Gas Water Heater||$$$$$||18.5 x 9.8 x 27.5"||82 pounds||190,000||5 GPM||94 %|
|Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater||$$$$$||10 x 18.5 x 26"||82 pounds||199,000||9.8 GPM||Up to 0.96|
|Noritz NRC661-DV-NG Indoor Natural Gas Tankless Water Heater||$$$$||6.7 x 13.8 x 23.6"||38 pounds||15,000 BTU to 120,000||6.5 GPM||93 %|
|MAREY Gas 10L Tankless Water Heater||$$||28 x 16 x 9"||24 pounds||N/A||3.1 GPM||87 %|
|Camplux 5L Outdoor Portable Propane Tankless Water Heater||$||11.4 x 5.5 x 14.6"||10.8 pounds||34,000||1.32 GPM||N / A|
|Rinnai V65EP Outdoor Propane Tankless Water Heater||$$$$||9 x 14 x 23"||60 pounds||150.000||6.6 GPM||82 %|
|Eccotemp i12-LP Indoor Propane Tankless Water Heater||$$$||15 x 24 x 4"||29 pounds||25,000 - 80,000||3 GPM||79 %|
|Ridgeyard 12L Propane Gas Tankless Water Heater||$||13.4 x 5.9 x 23.2"||22 pounds||N / A||3.2 GPM||up to 60 %|
|Eccotemp FVI-12 Indoor PropaneTankless Water Heater||$$$||28 x 17 x 10.5"||29.4 pounds||74,500||3.5 GPM||0.79|
Now that you know everything you need to choose the best gas tankless water heater, you can choose the right gas tankless water heater for your household’s specific needs and get the full range of benefits they offer. Now it is time to make a choice and enjoy the endless hot water!