However, they are energy inefficient and prone to lose heat from the tank even when hot water is not being used ... "Heat pump water heaters are more costly to buy and install than other models ...

Tankless water heaters ... before you buy. To help us make our choices, we consulted industry experts, evaluated consumer reviews, and surveyed 100 people who have owned or used tankless water ...

The number of years of energy savings (from a new water heater) needed to cover the purchase and installation costs of replacing an existing water heater. The number of years of energy savings ...