Best Tankless Gas Water Heater 2021 ( Review & Buyer Guide)

Did you know tankless gas water heaters have longer life span than tanked heaters?

Tankless water heaters also save energy, space, and money, but you still have to make the right choice when purchasing one.

If you’ve had enough of high electricity bills and you want an environmental-friendly option, then you should go for the best tankless gas water heater.

In case you have no experience with these units, we are here to explain it all in detail.


Here comes a list of the highest-quality options from the section of tankless gas water heaters.


What Is The Best Tankless Gas Water Heater Today?

Living in a small apartment, living with six family members, living on-the-go lifestyle – we thought of every one of you and collected the best products on the market intended for different users and different uses (indoor and outdoor).

1.      RUC98iN Ultra Series Natural Gas Tankless Water Heater by Rinnai : OVERALL PICK

When Rinnai was designing the RUC98iN Ultra Series Natural Gas Tankless Water Heater, they had one goal in mind – to produce the most efficient tankless water heater on the market. In other words – you can benefit a lot from this water heater in terms of financial savings.

You can choose between natural gas or propane – this unit works both ways. Its flow rate reaches 9.8 gallons per minute and it can supply the whole family with no hustle.

The great thing about this water heater is that it can provide smooth flow up to four bathrooms and a couple of kitchen faucets – at the same time!

This unit has the temperature range up to 140 degrees Fahrenheit, even though people who use it for commercial purposes can raise the temperature to 185 degrees.


  • 199,000 BTU per hour
  • Highly efficient
  • Super quiet
  • Supplies multiple faucets at the same time
  • Heat exchanger comes with a 12-year warranty
  • You may need professional help to install it

Buy on Amazon


2.       Enjoy Outdoor Life BD264 Propane Tankless Gas Water Heater by Camplux  : TOP SELLER PICK

The Camplux BD264 may be the optimal solution for people living in small apartments, houses, cabinets, or travel a lot in their boathouses or between campsites.

If you have enough room in your five-wheel vehicle, camper, or RV for proper combustion and a flue pipe, you can take advantage of this as well, as the BD264 works this way, too.

The maximum power output of the DB264 is 68,000 BTU, while the hot water output is about 2.64 gallons per minute.

In case you want a stronger pressure, a 12-Volt pump will provide you with the desired amount in seconds.

Camplux is a reliable brand.

These guys wanted to ensure most safety of their customers so they designed a water heater with over-heating and anti-freezing protection.

The DB264 comes with all the needed adapters and CSA approved gas regulator.

Just make sure not to use this gas water heater for drinking water and to use propane gas instead of natural one when installing the unit.


  • Compact size
  • 2.64 gallons/minute
  • Over-heating and anti-freezing protection
  • Works with propane gas only

Buy on Amazon




3.       RTGH-95DVLN 9.5 GPM Tankless Natural Gas Water Heater by Rheem : ENERGY-EFFICIENT PICK

If you are looking for an outdoor tankless gas water heater, the RTGH-95 DVLN may be the right pick for you.

It can use either propane or natural gas as a power source.

It provides a solid flow rate of 9.5 gallons per minute, which makes it suitable for large families.

You and your lovely ones can use multiple faucets in bathroom and kitchen at the same time.


When we say the RTG-95 DVLN reaches up to 94% of efficiency, we are not making jokes with you.

This is definitely the best tankless gas water heater for people who are looking for a high-efficient and environmentally friendly type of unit.

Thanks to the EcoNet smart technology, you can control this model via an application.

The app makes it easy to adjust the water temperature and gas power according to your needs through your phone.

The RTG-95 DVLN is made of stainless steel and comes with a 10-year warranty.

That’s cool!

  • Supports natural gas and propane
  • Stainless steel construction
  • Remote control available
  • 10-year warranty on heating parts
  • Makes a lot of noise

Buy on Amazon

4.     Portable Tankless Gas Water Heater by Gasland : BEST PRICE PICK

Hot water on demand no matter where you are? It is possible, thanks to the Portable Gas Tankless Water Heater by Gasland.

If you are passionate about traveling, camping, RV life, and hiking, this water heater may come really handy.

It is lightweight and compact so it doesn’t take much space.

Freezing or extremely hot weather conditions won’t harm this unit at all, as it provides overheating and anti-freezing protection.

You and your family would be safe always.

The maximum power output of 41,000 BTU is more than enough for traveling purposes.

Only 2.5 PSI of water pressure is needed to start this thing up and to supply you with 1.58 gallons per water.

It can warm up water temperature up to 167 degrees Fahrenheit.

You can save up to 11.5% of energy and save some money thanks to this water heater.

As you are a traveler, you probably care about the environment, so you will appreciate the fact this tankless water heater is designed to decrease gas consumption.

The Gasland Portable Tankless Gas Water Heater comes with a 1-year warranty, and the manufacturer would return 100% of your money in case you are not satisfied with their water heater.

  • Compact, lightweight, and portable
  • Saves up to 11.5% of energy
  • Environmental-friendly
  • Easy installation
  • 1-year warranty
  • Bad customer service
  • A bit pricey

Buy on Amazon

5.      FVI-12-LP Liquid Propane Gas Tankless Water Heater by Eccotemp : SMALL SPACES PICK

If you are living in a small or middle-sized home or apartment, you certainly won’t need a huge water heater.

The FVI-12-LP model by Eccotemp is one of the best tankless gas water heaters for two main reasons – it provides more than a solid flow rate and it is very compact.

This unit can supply you with 3.6 gallons per minute of water flow.

You and your family members can use two faucets with the same time – bathroom and kitchen, for example, and this heater would still meet your needs.

The demanded power input of this tankless water heater is 80,000 BTU per hour.

We are talking about the smallest gas water heater of the whole line of Takagi tankless water heaters, while it may be hard to find such a light and compact model even if you would look up for it among other brands.

If you care about efficiency, you can count on the FVI-12-LP as well – it will cut your heating costs in half. It is designed as an energy-saving and environmentally friendly unit.

  • Stylish and compact
  • Liquid propane gas heaters
  • Supports two faucets at the same time
  • 2-year limited warranty
  • A bit noisy

Buy on Amazon

Benefits of Using Tankless Gas Water Heaters

You can use electricity or gas to power your heating unit.

However, if you have been using electric water heaters until now, you probably noticed the drain in your wallet.

That is the main reason why tankless gas water heaters gained popularity in the last few years – they are highly efficient.

What is even better, you can choose between natural and propane gas, as most of the tankless gas water heaters we reviewed in this article support both.

There is no need to wait, these water heaters will supply you with hot water at any time.

Tankless gas water heaters are environment-friendly as well, as they spend less energy than the electric ones and they don’t produce any fume.

You are not going to believe this, but gas tankless water heaters are recyclable as well!

Additionally, these water heaters are space savers!

There is no need to store water in a tank, as the unit produces hot water the second you turn the faucet on.

If you care about the aesthetics, you will love gas tankless water heaters for one more reason.

They are easy to hang on the wall and fit compact spaces.

Our Choice

Having the most important features of a tankless gas water heater in mind (supply, power, efficiency, and price), we came to a conclusion one of the 5 above-reviewed products deserves the title of the best tankless gas water heater.

Are you already guessing?

The title of best tankless gas water heater goes to :

RUC98iN Ultra Series Natural Gas Tankless Water Heater by Rinnai.

This unit provides enough hot water for multiple faucets in your home, it is super quiet, delivers 199,000 BTU per hour, and it comes with a 12-year warranty for the heat exchanger.



Even though you would have to spare a couple of bucks more on a tankless gas water heater, believe us when we say it is totally worth it!

You want to make smart decisions, and purchasing such a unit is indeed smart.

A tankless gas water heater is a long-term investment, but it will pay off in not more than a year.

These units are highly durable and super-efficient, but environmental-friendly as well.

We hope our guide and unbiased reviews made you think about purchasing a tankless gas water heater.

Keep in mind the most important features we also mentioned and there is no doubt you will pick the best tankless gas water heater for your needs. After all, if in doubts – just go for the one we recommended!