Unlike traditional tank water heaters, tankless water heaters do not require storage of hot water and they need less space because they heat the water on-demand, and that too very quickly.
So if you are looking for such a product then you are in the right place.
So what is the best tankless gas water heater for you?
Our comprehensive guide includes the best tankless gas water heaters and we even created a table in which we compared all the products and included detailed specifications of each water heater. We hope you find the right suitable product for your needs.
| Rinnai V65IN (Best Indoor Water Heater)
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| Rinnai V65eN (Best Outdoor Water Heater)
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| Rinnai RU199iN (Highest Capacity Indoor Water Heater)
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| AQUAH JSD20K (Cheapest yet Quality Water Heater)
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| EZ Ultra HE
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| Noritz EZTR40NG
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The Best Tankless Gas Water Heater
1. Rinnai V65eN Outdoor Tankless Gas Hot Water Heater
Rinnai V65eN is our top pick for the best tankless gas water heater. Rinnai is a very well-known company in the household industry and its products are reliable and offer excellent features.
This unit delivers a maximum of 120,000 BTU and can only be installed outdoors. Moreover, it meets California and Texas NOx emissions standards.
Its ThermaCirc360 technology recirculates the hot water through the pipes so you will get hot water on-demand and the fuel cost will decrease significantly.
Moreover, the compact design of this heater will allow you to install it anywhere hence it will accommodate less space.
You will get a 6.5 GPM of flow rate for hot water and it is enough for most small to medium household applications.
2. Rinnai V65IN Indoor Gas Tankless Water Heater
Rinnai V65IN is another gas tankless water heater and it can only be used indoors. It offers a 6.5 GPM of hot water flow rate and this heater can work even under low water pressure.
Additionally, you can control the water heater using the mobile app and schedule the heating timings throughout the day. This particular unit is an energy star-qualified machine with an energy factor of 0.82 for natural gas and propane.
This unit’s efficient compact design cuts CO2 emissions thus it will waste less energy and conserve more water compared to standard water heaters.
If we talk about the warranty, then you will get a 10-year warranty on heat exchangers, 5-year on parts, and 1-year on labor so it will be a pretty good deal in my opinion.
3. Rinnai RU199iN Sensei Gas Tankless Water Heater
Rinnai RU199iN is one of the highest capacity and most advanced tankless gas water heaters on our list. It boasts an 11 GPM hot water flow rate and provides a maximum of 199,000 BTU heat energy to boil the water instantly.
The Circ-logic technology of the water heater recirculates the water so it will use less energy and thus you will save plenty of money on fuel costs.
This water heater is also equipped with WI-FI technology so you can control it wirelessly and you can also use the optional Control-R module to control the water heater using voice activation.
The whole unit weighs about 64 pounds and measures 18.5 x 11.45 x 31.3 inches. You will also get a decent warranty on this product so it will last longer than you think.
4. EZ Ultra HE Natural Gas Condensing Tankless Water Heater
EZ Ultra HE Natural Gas is a mid-range water heater intended for medium to small-size applications. This unit uses exhaust gases to preheat the water, which in turn increases the efficiency.
You can use this water heater indoors as well as outdoors too but you just have to provide the proper ventilation to the device. The PVC piping and condensation trap allow for vertical venting, horizontal venting, and diagonal venting.
It even features a precise and safe water flow sensor to stabilize the exit water flow. Additionally, this water heater uses exhaust gases to preheat the incoming cold water so it increases efficiency.
The maximum GPM of this water heater is 3.4 and it can function at 8 PSI water pressure. It is equipped with the latest AI design that remembers the last temperature setting so you don’t have to manually enter it every time.
5. AQUAH JSD24-K Indoor Natural Gas Tankless Water Heater
AQUAH JSD24-K is one of the cheapest tankless natural gas water heaters we have added to our review list. This unit offers a 3.2 GPM of hot water flow rate.
It features automatic electrical pulse ignition with no standing pilot and it can be operated by either 2 D batteries or 120V AC power.
With a maximum of 81,946 BTU heat energy, you can use hot water in your entire house and this gas tankless water heater has 85% thermal efficiency.
Also, note that it requires 4-inch double wall type B-vent pipes to use this water heater and it is not included in the whole package.
6. Noritz EZTR40NG Indoor Gas Tankless Water Heater
Noritz EZTR40NG has a 6.6 GPM water flow rate and it can easily replace the 40-gallon water heater. To reduce the piping modification, it comes with plumbing on top.
The whole package also includes the required valve kit and venting pipes to get you started right off the bat. It boasts a K-copper heat exchanger, which is very durable and efficient.
Moreover, this gas tankless water heater condensates the water so it requires a drain. Also, this type of heater has an ignition system that uses either a 120V power supply or small batteries.
Before you start the water heater, make sure you have sufficient gas pressure as well as water pressure available. You will get a 12-year warranty on the heat exchangers, 5-year on parts, and 1-year on labor.
