Natural gas tankless heaters are trending due to outstanding performance in cold climates at lower fuel cost. Also a best gas tankless water heater provides consistent temperatures along with a high volume of hot water, meanwhile energy consumption is low.
Though the gas models are a bit expensive and their initial cost is high, think of the long run benefits, come with a gas tankless water heater. It is really cool to know that you save almost $108 annually on electric bills. They last long ( more than 20 years if maintained properly).
In like manner, not only they are energy efficient, but eco friendly and do not pollute the environment as compared to their conventional counterparts.
On the contrary, they are comparatively pricey as they require the proper installation of ventilation ports and fuel hookups. Moreover the availability of natural gas in your location is necessary for sure.
There are a multitude models of natural gas tankless water heaters, and to choose the one compatible to your instant hot water demand is really a hard choice. Here, we come forward with tankless gas water heater review to make your decision best.
Our reviews about best tankless water heaters powered by gas are thoroughly researched and unbiased, helping you to buy the best tankless water heater gas for your family.
Top Rated Gas Tankless Water Heater – Honest Reviews
The following list of natural gas tankless water heater reviews shows these models are far superior and competent. Equipped with user friendly technology and economical prices would make your decision easier.
|Rinnai RUC98iN Ultra Series Indoor||Max GPM: 9.8
BTU: 199,000 max
|Rheem RTGH-95DVLN 9.5 GPM Indoor||Max GPM: 9.5
BTU: 199,900 max
|Takagi T-KJr2-IN-NG Indoor||Max GPM: 6.6
BTU: 140,000 max
|Rinnai V65IN Indoor Installation||Max GPM: 6.5
BTU: 150,000 max
|CAMPLUX ENJOY OUTDOOR CM264-NG||Max GPM: 2.64
BTU: 68,000 max
|Eccotemp i12-NG Tankless Water Heater||Max GPM: 3
BTU: 80,000 max
|Rinnai RL94IN Natural Gas||Max GPM: 9.4
BTU: 199,000 max
|Rheem RTG-84XLN Outdoor||Max GPM: 8.4
BTU: 157, 000 max
|Rinnai V65eN Outdoor Installation||Max GPM: 6.3
BTU: 120,000 max
|Rinnai RU199iN Indoor Installation||Max GPM: 11
BTU: 199,000 max
- Top Rated Gas Tankless Water Heater – Honest Reviews
- 1. Rinnai RUC98iN Indoor Natural Gas – Best Instant Hot Water Heater Overall
- 2. Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent- Whole House Gas Tankless Water Heater
- 3. Takagi T-KJr2-IN-NG Natural Gas- Gas Tankless Hot Water Heater
- 4. Rinnai V65IN Tankless Water Heater – Natural Gas Indoor Water Heater
- 5. Camplux CM264-NG Natural Gas Residential Water Heater- On Demand Gas Water Heater
- 6. Eccotemp i12-NG Tankless Water Heater – Budget Friendly Tankless
- 7. Rinnai RL94IN RL Series HE+ Tankless Hot Water Heater – Top Rated Tankless Gas Hot Water Heater
- 8. Rheem RTG-84XLN Tankless Water Heater – Most Efficient Tankless Water Heater
- 9. Rinnai V65eN – Instant Hot Water Heater Gas
- 10. Rinnai RU199iN Sensei – High Efficiency Tankless Water Heater
- Venting System For Gas Tankless Heaters
1. Rinnai RUC98iN Indoor Natural Gas – Best Instant Hot Water Heater Overall
Rinnai RUC98iN is an indoor gas tankless water heater with an electric ignition system. This heater consists of a digital display to monitor temperature and it could be regulated by a MC-91-2US controller. It also contains a temperature lock feature that restricts unauthorized use. The venting of this unit consists of concentric and twin pipe PVC. Being the best tankless gas water heater, Rinnai RUC98iN operates on natural gas which requires a maximum 199,000 BTU/H. It ultimately provides 96% efficiency rate with an energy factor of 0.92 EF.
Due to its wide range of temperature starting from 98-140-degree Fahrenheit, it is perfect for domestic use and for commercial use temperature ranges from 98°F to 185°F.
Talking about its GPM which is 9.8, makes this unit the biggest tankless hot water heater. You can get hot water available at 4-5 faucets working simultaneously without reduced water flow. It consumes 64 Watts electric current. But in winters there should be at least 146 Watts electricity to prevent it from freezing.
Hot Water On-Demand
Rinnai tankless water heater puts back hot water into circulation via pipes to provide hot water rapidly. Even if your home does not have a separate return line, Rinnai’s SE+ Series due to its ThermaCirc360 technology can operate without putting an additional line.
This unit provides a tremendous water flow rate of 9.8 Gallons per Minute. It provides a maximum pressure of 150 PSI and can be used at various channels at the same time.
This compact unit allows you to utilize your space more efficiently – since it is only the size of a suitcase. One of the most significant features of the Rinnai tankless water heater is that it could be installed in unusual spaces like attic and closet. It also ensures an easy and unstrained installation process.
In case you face some technical issue related to any part you don’t need to buy a whole new unit because all spare parts of Rinnai Tankless water heater are available at extremely affordable prices.
Research revealed that Rinnai Tankless water heater helps to lower the electricity bills – since it works on natural gas ( which is a lot cheaper than electricity) and because you use it only when you need it.
Easy Installation and warranty
This heater is extremely easy to install and offers an amazing warranty of 12-year on heat exchanger, 5-year on parts, 1-year on labor for residential application
And for commercial application: 5-year on heat exchanger, 5-year on parts, 1-year on labor.
2. Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent- Whole House Gas Tankless Water Heater
Rheem RTGH-95DVLN comes with an amazing 9.5 GPM flow rate. The recirculating kit provides rapid hot water and saves up to 12,000 gallons water/year. It offers fast heat up to approximately 8,400 ft height above sea level. Its smart electronic controllers help ensure safety and make it energy efficient. It works on natural gas which makes its usage very affordable.
Its amazing temperature lock feature with digital display protects it from any accidental working. Its freeze protection is up to -30°F.This impressive heater provides a great GPM rate which allows you to have hot water in 4 bathrooms at a time – which is enough for a relatively large family. It’s extremely low NOx emission makes it environmentally efficient and hazard free.
This unit provides efficiency at a very reasonable cost. It operates on natural gas providing 94% energy efficiency and is proved to significantly reduce your bills. It comes with the new stainless-steel heat exchangers condensers make this model the best on demand water heater.
Availability of Water to Multiple Faucets
This device ensures that your precious time is not wasted waiting for the hot water – hot water on demand gives huge savings. It has the capacity to serve multiple applications such as dishwasher, washing machine and baths simultaneously.
With its new feature including venting with band connections makes it even more convenient to install.
- venting up to 150 ft with 3″ PVC pipe
- 60ft with 2″ PVC
This heater covers a 12-Year warranty on heat exchanger, 5-Year on parts and 1-Year on labor.
3. Takagi T-KJr2-IN-NG Natural Gas– Gas Tankless Hot Water Heater
This unit offers you an amazing 6.6 GPM flow rate which is a unique feature – if you compare it with other tankless heaters of similar category. The most amazing thing about this unit is that it is the smallest water heater in the world making it perfect for small apartments, huts and is capable enough to supply hot water to 2 bathrooms at a time.
Takagi T-KJr2-IN-NG has proven itself to be the most reliable indoor tankless water heaters. Output capability of this unit is almost equal to a 40-gallon tanked water heater.
Air fuel Ratio (AFR) sensor keeps a constant check on temperature fluctuation and prevents the system from emitting harmful gases such as NO and NO2. To enjoy long years of comfort, you can rely on its durability.
It shows great competence as it does not require electricity. Natural gas is the sole fuel to make this unit operational, which results in saving a huge amount of money.
Takagi T-KJr2-IN-NG provides a maximum flow rate of 6.6 GPM but you can reduce it according to your need.
You can also change the temperature of hot water ranging from 120 to 167degrees depending upon your desire. This compact size unit will provide 83% efficiency which will definitely save your pocket from heavy bills.
Commercial grade copper is used in this heater which ensures much improved and smooth transfer of heat, minimizing the damage through corrosion. Therefore, they last for long and work optimally.
This heater comes with all the direction to install and operate which makes it extremely user friendly.
This product has 10-year heat exchanger warranty and 5-year warranty for the parts. Users can claim warranties only if the heater was installed according to the instructions provided and by a certified professional.
4. Rinnai V65IN Tankless Water Heater – Natural Gas Indoor Water Heater
Owning to its compact design Rinnai V65IN is among the top choices for small houses and apartments. It is an indoor top rated tankless water heater in which the company incorporated latest technology that ensures the heater consumes 40% less Energy as compared to conventional gas heaters thus, reducing the bills.
Heat and Water Flow
The gas consumption of the heater ranges between 10,300 – 150, 000 BTU. And it provides 6.5 GPM when there is a small temperature rise. Important to note that, with extreme cold inlet water temperature, this gas tankless water heater provides 3.3 GPM only.
Considering its compact design this flow rate can support two sinks, and one hot shower at a time without running out of hot water.
Due to the latest technology of copper Heater exchanger, it operates at maximum efficiency ultimately ending up causing a reduction in net energy use. Amongst many other features the heater has three Modes of operation that can be selected manually as per requirement
- Standby mode = 02 Watt
- Normal mode = 76 Watt
- Anti Frost protection mode = 120 Watt
The latest Wi-Fi technology incorporated in the heater, allows the user to have multi management features. Hence, providing full remote control of the unit from anywhere in the house.
According to the majority of the customer reviews, this tankless heater is extremely easy to install. However, you need to do some research before installing this unit by yourself.
But if you find it difficult you can always call the experts to install the heater.
- The warranty of this product covers the following areas
- 120 months warranty for Residential Heat Exchanger
- 12 months warranty for Residential Labor
- 60 months warranty for Residential Parts
5. Camplux CM264-NG Natural Gas Residential Water Heater– On Demand Gas Water Heater
CM264-NG is an indoor tankless water heater which is extremely suitable for small houses, apartments and motor vehicles. This heater has a digital display from which you can easily control and monitor temperature.
CM264-NG tankless water heater has some other impressive features such as innovative combustion defense, protection from frost and inbuilt maintenance notifier.
Dry combustion feature and digital temperature control option makes it 88.5 % efficient. This water heater works on 0.4 PSI and provides a maximum output of 68,000 BTUs each hour.
The temperature increases up to 77- degree Fahrenheit at 2.64 GPM. This unit is specifically designed to save space and money at the same time. It is suitable for a maximum 2000 ft height.
You can easily set the temperature according to your need with its special summer or winter options. This model does not require any heavy tools or machinery for installation because this is a ready to install heater with a powerful ventilation pipe.
Successful operation depends on natural gas and electricity of 20 KW . The moment the sensors observe water flow in the pipes the system itself starts working.
The tag price of this CM264-NG is nothing compared to the features it provides. Since it works on natural gas/propane, it helps you save a lot of money. You can utilize its WI-FI connectivity feature to start or stop according to the need – thus, saving both time and money.
Although this heater is to be installed indoor, its venting pipe must be outside in order to safely discharge exhaust into the atmosphere. When the temperature reaches up to the desired demand (optimum temperature), the system stops automatically rather than wasting energy. Moreover, this unit features eco and full gas switch for energy saving and get ideal hot water temperature.
Easy Installation and warranty
It is easy to install indoors because of its compact size and offers a limited warranty of 1 year.
6. Eccotemp i12-NG Tankless Water Heater – Budget Friendly Tankless
The Eccotemp i12-NG tankless water heater is an innovative and advanced model which makes it superior to any other heaters available on the market.
It comes in a smooth black laminated safety glass, mechanized temperature monitoring option and a digital display touchscreen to control and observe temperature and water flow.
This unit is a ready to install and its 110/120-volt UL listed power wire regulates the ventilator inside it, LED screen and Product Control Board. It works efficiently up to 5500ft. It is a natural gas-based heater and is rated at 80,000 BTUs.
This unit offers an impressive water flow rate of 3 GPM with a 35-40 degree rise in temperature. Whereas, at 1.5 GP the temperature increases up to 70- degree. It is suggested as a perfect choice for a small family of 2-3 members. It is also suitable for small apartments, cabins, motor houses and commercial use. Eccotemp i12-NG has the ability to deliver hot water to 2-3 multiple faucets at the same time.
This unit is proved to be an extremely efficient and budget friendly heater. The advanced PCB (Product Control Board) and improved gas plugs ensures best performance and comfort without disturbing the customer’s wallet. You don’t need to worry about the safety and security being equipped with water movement sensors and child-lock features.
This heater is designed for indoor operation and is easy to install. But you might want to hire a professional because the manual is not always easy to understand.
Due to its small venting pipe, high heat output (80,000 BTU) and the need to install safety pressure release, it is recommended to ask an expert for installation.
If this unit is installed and operated according to the provided instructions then Eccotemp provides a 2 year limited warranty.
7. Rinnai RL94IN RL Series HE+ Tankless Hot Water Heater – Top Rated Tankless Gas Hot Water Heater
Rinnai RL94IN is the best natural gas tankless water heater equipped with state of art technology that is suitable for both Indoor and outdoor facilities. It provides a sound efficient environment so that one can just install it and forget after that. It will provide you continuous hot water in an effective and efficient manner.
It requires a minimum of 10,300 BTUs and a maximum of 199, 000 BTUs and operates between 98-degree Fahrenheit to 140-degree Fahrenheit- making it a thermal efficient unit.
This heater is considered a workhorse since the heater works very quietly and smoothly. Also, Rinnai RL94IN tankless heater provides hot water to approximately five faucets simultaneously and there is no shortage of water at all.
This unit operates with an impressive GPM of 9.4 making it possible to wash dishes, do laundry and even take bath at the same time.
Easy to install
This heater is very easy to install and operate. You can do the installation by yourself by following the directions provided on the handbook.
Also, you don’t need to have heavy tools or machinery to install this unit.
The standout feature of this heater is that it provides the recirculating facility which helps the owner in receiving water instantly without wasting any time and water.
Having a built in Wi-Fi system makes it even more effective for the operator to control this heater from any part of the house and at any time.
- Rinnai RL94IN comes with a long warranty for its parts and labor.
- Residential Heat Exchanger – warranty for 144 months
- Residential Labor – warranty of 12 months
- Residential Parts – warranty of 60 months
8. Rheem RTG-84XLN Tankless Water Heater – Most Efficient Tankless Water Heater
This tankless water heater comes with an incredibly efficient flow rate of 8.4 GPM which can serve 3 bathrooms at the same time – enough for a family of 4-5 members. Also, you don’t need to leave your comfy bed anymore to switch on the heater because it can be controlled with smartphone connection as well as with the digital controller. There are many other impressive features of this heater such as low NOx – environment friendly; built in feature which sends automatic maintenance alerts; 83% efficient with 0.83 EF.
Plus, this biggest tankless hot water heater is designed with such material and in such a manner that it could survive up to -30 degrees without any change in hot water flow. It is renowned as one of the most robust heaters in the market. It consumes 157, 000 BTU of natural gas and provides uninterrupted water output.
Rheem RTG-84XLN provides hot water in seconds after starting the unit so that you don’t have to wait too long. Usually tankless heaters take some time to give hot water input due to their low activation degree.
However, this tankless water heater with the support of efficient GPM provides rapid and continuous supply of water. Therefore, it is not wrong to call this uit the best tankless hot water heater gas fueled.
The best feature of the Rheem RTG-84XLN is that you can control and manage the temperature and water flow with the help of a digital display. Rheem RTG-84XL tankless heater comes with a re-circulation flow kit that makes it efficient up to 100%, so that you can use hot water the time you open the tap. It ensures safety and protection against over heating.
This unit is to be installed outdoor which consequently helps you to save a lot of space inside the house.
Rheem offers users’ friendly warranties. Similarly, the RTG-84XLN has an impressive 5-years parts warranty, 1-year labor warranty and 12-years heat exchange warranty.
9. Rinnai V65eN – Instant Hot Water Heater Gas
Rinnai V65eN is an ideal tankless water heater for small to medium residential spaces and is qualified to be operated in trailer houses as well. Being the best tankless water heater powered by gas requires a maximum input of 150,000 BTUs and can be ignited with a 0.4 GPM flow rate initially.
Due to its incredible hot water flow rate (6 gpm tankless water heater); Rinnai V65eN is sufficient enough to serve 2 or more bathrooms at the same time. It requires 57 Watts of electricity on operation mode, standby mode requires 2 Watts and 104 Watts to prevent its parts from freezing.
It is designed to work on extended temperature range i.e. from 98 degrees Fahrenheit up to 140 degrees Fahrenheit. Though this is not energy star qualified but uniform energy factor is 0.79.
This unit is capable of connecting with WI-FI and you can easily control and monitor this heater with a Rinnai digital remote controller. You can have a safe and secure experience with its special temperature lock feature that prevents unauthorized access.
Stress Free Installation
It is a compact and easy to install heater. You can easily install this heater with the help of the steps provided on the customer guidebook. Also, no heavy tools or expert plumbers are required to install it which is pretty amazing.
Being an outdoor installation, no need for specific venting as it direst vents to the outside.
This unit guarantees efficiency and reliability at a very reasonable cost. It operates on natural gas providing 85% efficiency output and is proved significantly to reduce your electricity bills. It has longer lifespan than traditional tank heaters.
- This unit has 120 months warranty for residential heat exchanger
- 12 months warranty for residential labor
- 60 months warranty for its residential parts
10. Rinnai RU199iN Sensei – High Efficiency Tankless Water Heater
Rinnai is wildly popular to manufacture tankless models powered by gas and this RU199 is no different. RU199iN is a high efficiency tankless water heater with a very low consumption of energy that saves you a lot of money. Direct Electronic Ignition system makes it even more prominent.
You can easily operate this heater with the help of an Integrated Controller or you can also go for optional controllers such as: MC-195T-US, MC-100V-1US, BC-100V-1US, MCC-91-2US. It has a wide range of temperatures which ranges from 98° F to 140° F.
Its feature of meter adjustment makes it perfect for both household and commercial use. Just like other Rinnai Sensei heaters, this one is also WI-FI compatible and provides easy access to set temperature and hot water output rate.
The Rinnai RU199iN provides a remarkable water flow rate of 11 GPM which makes it a whole home tankless water heater. This unit runs on natural gas as well as on propane gas which are certified and environment friendly gas types. It has an energy factor of 0.96 EF – which makes it extremely efficient.
The availability of Wi-Fi connecting features makes it even more easy to use. This device offers fast heat up for up to 10,200ft. It is a very compact and space saving heater so you don’t need to create extra space in your home- since it fits almost anywhere. It is a mobile home certified heater with ultra-low NOx emission- to create an eco-friendly atmosphere.
Since this water heater works only on your demand so it ends up saving a lot of energy. Also, it comes with a fiber web in the burner to ensure equal and uniform flow of heat without wasting energy. It requires 15,000 BTU to 199,000 BTU to regulate properly.
Availability of water to multiple faucets
Rinnai RU199iN series ensures that you don’t waste time waiting for the hot water – hot water on demand is expected to provide a big savings. It is a perfect choice for a family of 4-5 people (3 bathrooms, dishwasher and washing machine).
This unit is ready to install – since it comes with everything you need.
- Warranty only applies on Residential application
- Heat Exchanger – 180 months
- Residential Labor- 12 months
- Residential Parts – 60 months
Venting System For Gas Tankless Heaters
To enhance the efficiency and functionality of natural gas tankless models, proper venting for tankless heaters is crucial.
On the contrary, the electric tankless heater models do not require venting but proper electric system to run the tankless heater properly.
Generally, the natural gas tankless units ventilates in two ways. They are:
- Direct Vent
- Power Vent
What is a gas tankless water heater?
It is one of types of tankless water heaters providing instant hot water on demand powered by natural gas. Natural gas is used to make them functional, so there is less consumption of energy and saving on electric bills ultimately.
Despite their costly initial installation, they provide long run benefits as natural gas is cheap. Gas tankless hot water heater delivers instant hot water when you need it without running out of hot water.
How does a gas tankless water heater work?
Tankless gas water heater does not store water like their traditional counterparts do. They heat the water instantly and deliver quickly.
When any water application turns on, the inbuilt sensor detects the flow, and the natural gas heats up the heat exchanger which further heats the water.
Surprisingly, the whole process completes in less than 10 seconds. A best tankless gas water heater ensures unlimited delivery of instant hot water.
What is the best gas tankless water heater on the market?
The superb gas tankless water heater has many outstanding features. Their optimal performance depends on their capacity, energy efficiency, energy star certification, output water flow, and price.
Natural gas tankless heaters have maximum water flow ranges from 6 to 11 GPM. for bigger households, 10 gpm tankless water heater to 11 GPM heaters with 180,000-199,000 BTU are sufficient.
For medium households, 6 to 7 GPM flow rate is more than enough, allowing multiple water applications simultaneously to be run.
The average energy factor rating or EF lies between 0.8 to 0.9. More simple way to understand this calculation is, 80 to 90% use of natural gas with 10 to 20% energy loss in order to heat up the water.
Apparently, the gas tankless water heaters look expensive due to their high prices. But at a broader level, this $1000 dollar would prove to be a 20 year investment after all.
Rinaai, Rheem, Takagi, Eccotemp and Camplus are some popular brands manufacturing high quality instant hot water heaters gas fueled.