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
$700 – $800
$650 – $700
$400 – $450