Best whole-house tankless water heater
This tankless water heater only burns gas when hot water is used, a fact that saves users some money. For an existing home, the lower installation costs of the A.O. Smith Vertex storage-tank water heater may make it a better buy. Both models are eligible for the 30 percent federal tax credit plus other Energy Star incentives. Gas tankless water heaters have a much longer average lifespan, though, and Rinnai earns top ranking among water heater brands. This model is recommended in more than one review, with praise for its build quality, ease of installation and excellent warranty. The maximum flow rate of 7.5 gallons per minute is enough for most households with two or three bathrooms.