Tankless 5 and 6 GPM Water Heaters

The larger tankless heaters in this category sometimes require a larger gas line into your home if they run on gas. They are more sophisticated than their smaller cousins, you can almost consider these heaters as computers that heat water. As a result, both installation and repairs can prove costly.

You should also be aware that electric models often require two circuits to work.

Some homeowners balance those costs with the generous tax breaks that many of these tankless heaters earn. The continued savings on energy bills are also very appreciated, and between those lower costs and tax credits, many of these models probably pay for themselves.

Rheem dominates this category with several models. The RTG-64DVN model is a direct-vent natural gas heater that provides 6.4 GPM. It also produces an electric model with 5 GPM that has drawn mixed reviews. Marey also makes a 5 GPM electric model that has drawn favorable comments.

Paloma weighs in with 5.3 GPM models powered by natural gas and propane in outdoor and indoor versions. They are recommended for 1- and 2-bath homes, not larger.
Eccotemp makes a 6.3 GPM electric outdoor model that can handle a medium-sized home and comes at a low price.

Tankless 5 and 6 GPM Water Heaters – High to low Ratings

Stiebel Eltron Tempra 29 Plus

Stiebel Eltron Tempra 29 Plus Electric Tankless Whole House Water Heater, 240 V, 28.8 kW

Rating: (4.4 out of 5 stars)
The Stiebel Eltron Tempra 29 is yet another Stiebel Eltron heater from the Tempra line. Like all Tempra’s, this is a whole house tankless water heater that uses 240 volts, but it draws in 28.8 kW in order to reach an impressive … [ more ]
Price Indication:
$700 – $800

Rheem RTG-64DVN

Rheem RTG-64DVN Direct Vent Indoor Series Natural Gas 6.4 GPM Tankless Water Heater

Rating: (4.3 out of 5 stars)
The Rheem RTG-64DVN Tankless Gas Water Heater belongs to the same series as the RTG-95DVN; the only difference being that this particular unit delivers lower volume at 6.4 gallons per minute (GPM). This indoor high altitude compliant water heater supplies … [ more ]
Brand:Rheem
Size:6.4 GPM
Price Indication:
$650 – $700

Eccotemp 40HI-NG

Eccotemp 40HI-NG Indoor Gas Tankless Water Heater, 135,000 British Thermal Unit

Rating: (4.1 out of 5 stars)
Eccotemp tankless water heaters are among the least expensive yet reliable heaters out now. If you have natural gas in your area and would like to shift to a tankless from a conventional storage tank, you may want to try the Eccotemp 40HI-NG Gas Tankless Water Heater that … [ more ]
Brand:Eccotemp
Size:6.3 GPM
Price Indication:
$400 – $450