Whole-house electric tankless water heater prices
Electric tankless heaters big enough for a home: 18 to 36 kW, which means 75 to 150 amps of panel capacity. 33 models from 5 stores, with prices checked daily.
Check the size your household needs and what it costs to run.
Best value ($/GPM)
$92
Atmor PRO XTP AT-36N-XTP 36 kW 240 V Self-Modulating Electric Tankless Water Heater · The Home Depot
Cheapest heater
$254
Atmor PRO XTP AT-18N-XTP 18 kW 240 V Self-Modulating Electric Tankless Water Heater · The Home Depot
Typical $/GPM
$151
Median across 46 in-stock listings
All stores
All brands
$/GPM is the price divided by the hot water flow the heater delivers at a 45 °F temperature rise, worked out from its kW rating. "Box GPM" is the maker's own maximum, often quoted at a much smaller rise, so it is shown but not ranked on. Your rise depends on your incoming water: the sizing calculator works it out from your ZIP.