Fuel Type: In gas tankless water heaters, there are basically two kinds of water heaters available in the market. There are heathers that either use Natural Gas or Propane as fuel. Generally, natural gas water heaters are more cost-effective as it’s a cheaper fuel than propane. However, propane burns slower than natural gas, so you’ll not need to buy it as much as Natural gas. So, you can choose whatever suits you best. Max Power Output: To check how powerful a water heater is, you can check it’s max power output. In the case of water heaters that use gas, the power output is given in BTUs/Hr which is basically the amount of heat produced by the heater in one hour. So, in this list, you will find water heaters with power ranging from 41000-199000 BTUs/Hr. Hence, you can pick any one of your choices. Don’t forget that a high-power heater will consume more fuel also. Water Flow Rate: Basically, a normal shower usually provides water at a flow rate of 1.5GPM. So, to use multiple showers along with a few small faucets at the same time, you should choose a water heater that delivers hot water at around 5-10 GPM. Hence, it’ll be a suitable choice for normal households.
In case you are not much aware of the features and facts about gas tankless water heaters. There’s no need to worry as we have already mentioned a detailed buying guide down below in this article for you. The “Buying Guide” contains all the important details about gas tankless water heaters which will help you choose the right option for your home wisely.
Best Gas Tankless Water Heater Chart
Best Gas Tankless Water Heater Reviews
1. Rinnai Indoor Tankless Hot Water Heater
How Long Do Water Heaters Last? Gas Water Heater Venting Options
Starting with the first gas tankless water heater on the list, it comes from one of the top-tier brands, Rinnai, which is immensely popular for making such kinds of water heaters in various types and sizes. This gas tankless water heater from Rinnai is one of the most energy and space-efficient water heaters you can find out there. With its optimal water pressure and flow rate of 6.3 GPM, it’s perfectly ideal for residential use as you can use about 2-3 showers at the same time with continuous water flowing at your desired hot temperature. In addition, it also has a gas leak detection feature as well that automatically shuts off the unit to save from any property damage. Moreover, it uses Natural gas, which makes it quite a cost-effective water heater for home use. In fact, it’s powerful enough to deliver a max power output of 150000 BTU/Hr and consumes only 76 watts of electricity, and 2 Watts on standby mode. Since Rinnai is such a popular and well-known brand, it provides a total 10-year warranty for the heat exchanger of this water heater. Best Features:
3 GPM water flow rate Max power output of 150000 BTU/Hr Gas leak detection
Pros:
Highly powerful Ideal for residential use Comes with a 10-year warranty
Cons:
Installation is a bit complicated
2. GASLAND Tankless Water Heater
Gasland is quite a well-known brand and definitely a good choice to pick if you are looking for a reliable and compact water heater that is portable and can be taken out on picnics. So, in case you love going out on picnics, but hate to use cold water, you can take this gas water heater out with you as it’s portable and can be easily installed in any RV as well. It is super safe to use as it comes with anti-freezing protection and overheating protection as well. Moreover, it can also detect unexpected flameout conditions and shuts off on its own automatically to ensure everyone’s safety. Moreover, it comes with its own showerhead as well, so you can simply use it for bathing as well. Despite being a portable gas water heater, it uses propane and delivers a decent power output of 41000 BTUs/Hr which is decent enough to provide hot water at 1.58 GPM continuously. Moreover, it’s quite energy-saving and its advanced combustion technology helps to make it work quietly as well. Best Features:
58 GPM water flow rate Max power output of 41000 BTU/Hr Comes with overheating and anti-freezing protection
Pros:
Portable and lightweight Ideal for outdoor use Fully adjustable heat and water flow
Cons:
Not good for household use
3. Eccotemp i12-NG Indoor 3 GPM Natural Gas
Eccotemp makes highly efficient and powerful gas tankless water heaters for indoor use, that serve you with hot water anytime you need it, without making a big hole in your pocket. The Eccotemp i12-NG series water heaters come with CSA certification, so you can trust their quality as they are totally safe for indoor use. For the installation of this heater, a 4” venting is also required which you can buy from the aftermarket for cheap. Apart from that, this is one of the best and most affordable gas water heaters that we would recommend you to check out. Despite having a lower price tag, it delivers a good water flow rate at 3 GPM. Not only that, this water heater is capable of delivering hot water of your desired temperature as it works quite quickly heating up the water at a rate of 75,000 BTU per hour. Moreover, it’s going to save you a lot of money as it doesn’t consume much power and uses Natural Gas as fuel. In addition, the manufacturer offers a 2-year warranty on the heat exchanger. Best Features:
3 GPM water flow rate Max power output of 75000 BTU/Hr CSA certified Natural Gas Tankless water heater
Pros:
Energy-efficiency Affordable option Comes with a 2 year warranty
Cons:
Venting kit not included in the box
4. Camplux Instahot Tankless Water Heater Natural Gas
Camplux is yet another decent brand out there that is highly popular for making all kinds of advanced water heaters, with exceptionally beautiful designs, which makes them suit modern home decors as well. This tankless water heater from Camplux comes for a highly affordable price and is perfectly ideal for small families. Speaking of this model, it uses natural gas, however, you can find the same model for propane as well, if you want. If we talk about the water flow offered by this water heater, it delivers 3.18 gallons per minute of on-demand endless hot water which is perfectly suitable for a family of 2-3 people. In fact, the power output of this water is also quite decent, rated at 82000 BTUs/Hr. Apart from that, it’s highly popular for its modern design, and also comes with an LED touchscreen at the front that allows you to adjust the temperatures on this water heater. Due to its solid construction and advanced engineering, it has a heating efficiency of up to 89.98%. Moreover, Camplux has also taken care of the safety as it comes with Dry combustion, flame failure device, anti-freezing protection, and overheating protection to ensure your safety. Best Features:
18 GPM water flow rate Max power output of 82000 BTU/Hr Anti-freezing protection and overheating protection
Pros:
Stylish design Has an LED touchscreen for control High heating efficiency
Cons:
Installation is a bit complicated
5. Rinnai RL94IN RRL94iN Tank Water Heater
As we said earlier, Rinnai is one of the top-tier brands that serve multiple good water heater options, and the Rinnai RL94IN RRL94iN is one of the best offerings that you can check out. This gas tankless water heater from Rinnai is a perfect option for you to pick if you live in a joint family as it can deliver on-demand hot water continuously at a flow rate of 9.4 GPM. Although it’s a bit large in size, and quite expensive as well, it’s actually very powerful and efficient with an energy factor of 0.82. Speaking of its power, it’s rated to produce 180000 BTU/Hr power output which is one of the highest in this whole list of water heaters. Moreover, since it’s a work on natural gas, you’ll save a lot of money on fuel annually, and even on electricity as it also comes with an Energy Star rating. However, the installation might be a little bit tricky as it requires dedicated venting to exhaust out warm gases. In fact, the best part about this gas tankless water heater is that it supports Wi-Fi and can be remotely controlled, and even accepts voice commands as well. Best Features:
4 GPM water flow rate Max power output of 150000 BTU/Hr Built-in Wi-Fi and Voice Activated
Pros:
Power Output is very good Ideal for big families Comes with a 10 year warranty
Cons:
Installation is a bit complicated
6. Takagi Natural Gas Indoor Tankless Water Heater
When it comes to making advanced water heaters, there is no competition for Takagi as it makes one of the best condensing water heaters in the market which are highly reliable and power-saving. Speaking about this water heater, it’s special than the others because it’s a condensing water heater that manages and takes care of the warm gases internally. Due to this reason, it conserves energy and reuses the heat that allows it to burn less Natural Gas than other water heaters. Moreover, it’s one of the most environment-friendly water heaters as it also satisfies the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx emissions. In fact, it features a commercial-grade heat exchange made of copper-alloy that offers almost 25% heat transfer making it one of the most efficient and powerful gas tankless heaters out there. With that said, it has a max power output delivery of 199000 BTUs/Hr, and a high water flow rate of 10 GPM, which is perfectly ideal for big families. In addition, the manufacturer also offers a 15-year warranty on the heat exchanger as well. Best Features:
10 GPM water flow rate Max power output of 199000 BTU/Hr Condensing Water heater
Pros:
Ultra-Low NOx emissions Good in energy conservation Comes with a 15 year long warranty
Cons:
Expensive
7. RecPro RV Tankless Water Heater
Coming up with the next gas tankless water heater on this list, we have a pretty compact yet powerful option from RecPro which is quite affordable and can be installed easily. If you are specifically looking for a compact tankless water heater to install in your RV, RecPro has a pretty good range of affordable options available including this one. Due to its smaller form-factor, it fits in small spaces easily, and the installation is pretty easy too. Moreover, it comes with an additional remote control as well that will help you adjust the temperature of the water as you desire. Speaking of its power, it delivers a decent output of 42000 BTU/Hr while using propane as the fuel. In fact, it has an automatic ignition feature and can heat up water at max of 51 degrees Celsius. In terms of safety, it has flameout protection as well that automatically shuts off this heater to avoid accidents. Moreover, for the inlet water having 72°F temperature, it can deliver hot water at a flow rate of 2 GPM which is quite decent for a heater meant for trailers. Best Features:
2 GPM water flow rate Max power output of 42000 BTU/Hr Flameout protection
Pros:
Ideally powerful for RV and trailers Easy installation Comes with remote control
Cons:
Not ideal for household usage
8. GASLAND Outdoors BE158B Tankless Water Heater
Next up, there’s another good option available from Gasland to discuss, and, like the previous one, this is also meant for outdoor use as it’s highly portable and easy to use. Although we have already discussed one such RV-compatible water heater, you can definitely consider this portable option as well. This water heater is designed and engineered to instantly provide you with hot water on-demand. Since it has a max power output of 41,000 BTU/Hr, it’s capable of drawing out hot water for you at a pace of 1.58 GPM which is great for outdoor use. In fact, it’s highly portable and lightweight, and also comes with a handle to lift it. On the other hand, thanks to its advanced combustion technology, it burns less propane and saves a lot of fuel, and doesn’t even make much noise while operating. Apart from that, it’s totally safe to use as it’s certified by CSA and comes with various safety features such as overheating protection, low water flows protection, high water pressure protection, and also dry combustion protection as well. Best Features:
58 GPM water flow rate Max power output of 41000 BTU/Hr CSA certified gas tankless water heater
Pros:
Lightweight and portable Has in-built shower head Safe and easy to use
Cons:
Only has 1-year warranty
9. Camplux Pro Natural Gas Tankless Water Heater
Lastly, there’s another good offering from Camplux, a brand that is highly popular for making stylish water heaters ideal for modern home designs, which do perform wonderfully as well. Coming over to its features, it’s an ideal water heater option for most households as it can deliver a continuous water flow at a rate of 6.86 GPM which is good enough. Moreover, this heater is actually quite powerful as it’s rated for the max power output of 180000 BTU/Hr. Not only that, since it uses Natural Gas, it’s even good for the environment. In fact, the energy factor of this water heater is 0.82 and has extremely low NOx emission levels making it highly environment-friendly and efficient. On the other hand, the design of this water heater is quite attractive. Moreover, it’s highly compact as well so you can almost install it anywhere in your home as it won’t take up much space. However, it’s actually meant for outdoor installations, so you don’t need any additional ventilation. Best Features:
86 GPM water flow rate Max power output of 180000 BTU/Hr Comes with anti-freezing protection and overheating protection
Pros:
Elegant design Compact and easy to install Ideal for a family of 3-4 people
Cons:
A little noisy
Buying Guide for the Best Gas Tankless Water Heater
Most people prefer gas tankless water heaters because they cost less than the electric ones and are overall budget-friendly in every possible way. Moreover, even the installation process of gas tankless water heaters is not as complicated as the other kind of heaters. With that said, we have already mentioned some of the best gas tankless water heaters in the list above. So, you can check out their features and choose one whichever suits you best. In case you want to know about the factors which should be considered while buying a new gas tankless water heater, this buying guide will explain everything important to you.
Fuel Type
First of all, you must decide if you want to choose a Propane or Natural Gas water heater for your home. If we compare both of them, both natural gas and propane work as great fuels. However, natural gas is slightly cheaper than propane and is more environmentally friendly for the environment. Propane, on the other hand, burns at a lower rate than natural gas, so you will not need to buy it as much as you will need to buy natural gas. That is why you will find most portable water heaters use propane as fuel. While the gas water heaters which are ideal for household usage use Natural Gas as fuel. However, you can find most heater options that offer two different models, one running on propane and another one of Natural Gas. So, you can choose whatever option you like or suits you best.
Max Power Output
Next up, you should check the max power output of the gas to know how powerful it actually is and how quickly it can heat up water for you. Generally, the heat combustion rate of gas water heaters is measured in BTUs/Hr. While the portable water heater options are not usually powerful, because of obvious reasons, they generally deliver a max power output of 41,000 BTUs/Hr which is comparatively less than water heaters that are used in households. Speaking about the water heaters meant for household use, you can find options with max power output ranging from 82,000-199000 BTUs/Hr. The rule of the thumb says that if you have a larger family, and the water requirement is more, you should invest in a powerful heater so it can heat up more water to serve multiple users.
Water Flow Rate
Generally, water heaters which have a high power output are capable of providing hot water at high flow rate. That said, if you have a big family, you should choose a water heater option that delivers water at a flow rate of 5-10 GPM to have a convenient experience. GPM basically stands for Gallons per minute, which tells you about how many gallons of water can be heated by the water heater in one minute. A normal shower head usually offers a water flow of 1.5 GPM, hence, with a water heater providing 5-10 GPM, you can use multiple showers and faucets at the same time. However, if you are looking for portable gas water heater options for your RV trailer, they are not usually very powerful and can serve only 1-2 people at one time.
Ventilation
Since gas water heaters involve the combustion of fuels, a lot of steam and toxic gases are released out of the water heater. Hence, if you are buying a water heater that is installed indoors, you should take care of the proper ventilation, and it might cost you a few extra bucks depending on the water heater you choose. On the other hand, less powerful water heaters used in RVs are usually designed while keeping ventilation in mind, so users don’t have to take much burden of it. There are a few gas tankless water heater options that are generally installed outside the home, so they also take away the burden of ventilation from your head.
Warranty
Since a water heater is a kind of appliance that everyone usually buys for long-term use, you should not forget to check for the warranty. With that said, you should always buy one from popular and reputable brands as they provide better after-sales services. Most of the water heater options that we have mentioned in the list come with a decent warranty, so you can get them easily repaired for free in case anything goes wrong.
Conclusion
That’s it, this was the list of all the best gas tankless water heaters that are available in the market right now. We have tried to mention almost all kinds of water heaters in the list, meant for indoor and outdoor usage so that every reader can find a suitable option for themselves. Moreover, with detailed descriptions along with the pros and cons of each water heater, you will be able to easily compare them and pick the best one for you. In case you are getting confused to pick one for you, feel free to pick one from our personal recommendations:
First of all, the Rinnai Indoor Tankless Hot Water Heater V65iN is one of the best options as it’s highly power-efficient and delivers a max power output of 150000 BTU/Hr using Natural Gas. Moreover, since it delivers hot water at a rate of 6.3 GPM, it’s perfectly ideal for a family of 3-5 members. On the other hand, if you are looking for an affordable option, Eccotemp i12-NG Indoor Gas Tankless Water Heater works using Natural Gas and delivers a high power output of 75,000 BTUs/Hr. In fact, it delivers water at a rate of 3 GPM continuously and comes with a warranty of 2 year long. In case you are looking for a portable option, the GASLAND Outdoors BE158 tankless water heater uses Propane and delivers 41000 BTU/Hr. Although the water flow rate is 1.58 GPM, it comes with its own shower head attached that can be directly used for bathing, whenever you are out traveling long distances.
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