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Best Gas Tankless Hot Water Heaters 2020

February 19, 2020 By Stuart Trevino

If you want something that can last longer than a tanked water heater, a good go-to is a quality tankless gas water heater. These products take up less space, use less energy, and they are durable. In an effort to find the best gas tankless hot water heater, we created a brief top 5 list of some of the most top-selling products. To help you come to a decision that best fits your individual needs, the reviews touch on a number of factors such as energy efficiency, average flow output, reliability, and more.

5. Camplux 5L 1.32 GPM Outdoor Portable Propane Tankless Water Heater

best camplux 5L portable gas tankless hot water heater

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  • Fuel Type: Propane
  • Installation Type: Portable | Outdoor
  • Item Dimensions: 11.4″ x 5.5″ x 14.6″
  • Item Weight: 10.8lbs
  • Max Gallons Heated/Minute: 1.32 GPM
  • Max Temperature Setting: 114.8ºF (46ºC)
  • Minimum Temperature Setting: 46.4ºF (8ºC)
  • Certification: CSA
  • Warranty: Money-back guarantee
Pros
Quick and easy installation.
Offers versatile pressure options.
Easy temperature adjusting.
Cons
Some models have been noted to spark.
Currently does not seem to feature an on/off switch.
The burner may be prone to going off sporadically.

Bottom Line

This water heater from Camplux may be the best gas tankless hot water heater in a complete portable design. It’s compact, and it features a folding handle, thus benefiting those who are camping, RV traveling or doing anything else concerning travel and the outdoors. Since it sells as a portable device, it is not intended for use in residential homes or for simultaneous use for multiple functions.

4. Rheem RTG-84XLN Low NOx Outdoor Tankless Natural Gas Water Heater

best rheem RTG 84XLN outdoor gas tankless hot water heater

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  • Fuel Type: Natural Gas
  • Installation Type: Outdoor
  • Item Dimensions: 14″ x 10″ x 26″
  • Item Weight: 54lbs
  • Max Gallons Heated/Minute: 8.4 GPM
  • Max Temperature Setting: 140ºF (60º)
  • Minimum Temperature Setting: 85ºF (29.4ºC)
  • Certification: Energy Star
  • Warranty: Parts: 5 years | Labor: 1 year | Heat Exchange: 12 years
Pros
Offers low NOx emissions for safer usage.
Has good consistency with hot water output.
Easily address multiple faucets simultaneously.
Cons
Must have professional installation to receive warranty.
The remote may sometimes be defective.
Installation can sometimes be difficult.

Bottom Line

With the Rheem RTG-84XLN, you get a model that can be expensive, however, it does have good value. The model is eco-friendly, and it mounts outdoors to help you save on more space indoors. With the flow output, it seems like a better option for smaller to mid-sized single-family homes.

Individuals in colder areas may not receive quality service with this model as the pipes can freeze if not insulated. Still, this is the best gas tankless hot water heater that’s safe for the environment. You can check here for more natural gas tankless water heaters.

3. Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

best takagi t kjr2 in ng gas tankless hot water heater

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  • Fuel Type: Natural Gas
  • Installation Type: Indoor
  • Item Dimensions: 6.7″ x 13.8″ x 20.3″
  • Item Weight: 38lbs
  • Max Gallons Heated/Minute: 6.6 GPM
  • Maximum Temperature Setting: 167ºF (75ºC)
  • Minimum Temperature Setting: 99ºF (37.2ºC)
  • Certification: Energy Star Qualified
  • Warranty: Parts: 5 years | Labor: 1 year | Heat Exchanger: Limited 10-15 years
Pros
Simple to program and operate.
Auto shut-off function if overheating.
Good at helping energy bills stay low.
Cons
Limited hot water for simultaneous use.
Some installation can get finicky.
May get slow delivering hot water.

Bottom Line

The Takagi T-KJr2-IN-NG model is a decently efficient product that is environmental friendly with a good energy output. It is small and lightweight, and the tankless water heater can mount rather well for a quality space-saving unit.

Apartment-dwellers and individuals in small single-family homes can see the most benefit from this. Anything larger, or if you have high heat usage, then you may not be able to receive an adequate amount of hot water.

2. Excel Tankless Gas Water Heater

best Excel gas tankless hot water heater

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  • Fuel Type: Propane
  • Installation Type: Outdoor | Indoor
  • Item Dimensions: 18″ x 7″ x 14″
  • Item Weight: 20lbs
  • Max Gallons Heated/Minute: 1.6 GPM
  • Maximum Temperature Setting: n/a
  • Minimum Temperature Setting: n/a
  • Certification: n/a
  • Warranty: n/a
Pros
Features an oxygen depletion sensor.
Vent-free design.
Easy to install.
Cons
May lack some consistency.
The safety start can be too sensitive.
Adjustments could be simpler.

Bottom Line

This gas heater from Excel may be the best gas tankless hot water heater for your travel use. It does not require a pressurized pump as you can start with 2 psi of water and work your way up to 120 psi. With a vent-free design, it not only works outdoor use, but it can function well in small indoor settings.

It is a gas tankless water heater that can best serve campers, those in RVs most of the time, individuals in small apartments, and more. However, this heater may not work as a permanent fixture in a small or larger family home.

1. Takagi T-KJr2-IN-LP Indoor Tankless Water Heater

best takagi t kjr2 in lp gas tankless hot water heater

Check Price
  • Fuel Type: Propane
  • Installation Type: Indoor
  • Item Dimensions: 6.7″ x 13.8″ x 20.3″
  • Item Weight: 38lbs
  • Max Gallons Heated/Minute: 6.6 GPM
  • Maximum Temperature Setting: 167ºF (75ºC)
  • Minimum Temperature Setting: 99ºF (37.2ºC)
  • Certification: Energy Star Qualified
  • Warranty: Parts: 5 years | Labor: 1 year | Heat Exchanger: 10-15 years (limited)
Pros
Quality low-noise operation.
Good safety protection measures.
Compact, space-saving design.
Cons
Doesn’t function well in larger homes.
Warranty not honored if professional doesn’t install.
Water pressure and flow seem to be temperamental.

Bottom Line

To conclude the search for the best gas tankless hot water heater, the Takagi T-KJr2-IN-LP is an indoor propane model that is simple enough to install. It has a good energy rating and it emits low NOx for eco-friendliness.

If you’re in the market for something extremely quiet and only need to heat up a few appliances at once, then this can work for you. Small single-family homes with 1-2 bathrooms, small apartments, and even cabins can benefit from this. Several occupants may not be able to use it well at once though.

Wrap Up

It appears as though many are going the tankless route for water heaters as it not only saves space but can conserve energy and gas usage. The best gas tankless hot water heater does that and more, but it’s important to choose the one that has the right flow output for your needs. With our article, you can quickly find one that suits you. If you’ve already tried one of the products here, feel free to let us know how it worked in a comment below!

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