Tank or tankless, for your household

Can a tank or tankless heater meet your hot water needs? In this example, your busiest hour uses 65 gallons of hot water.

In the test, 629 of 763 gas tanks give at least 65 gallons in the first hour. Of 505 electric tanks, 95 give at least 65 gallons in the first-hour test. Of 481 heat pump tanks, 365 give at least 65 gallons in the first-hour test.

Fixtures running together need 3.25 gallons per minute in this example.

Cold water at 50°F needs a 70°F rise to reach 120°F. At a 70°F rise, an estimated 451 of 487 gas tankless models reach 3.25 gallons per minute. An estimated 6 of 337 electric tankless models reach that flow at the same rise.

Your busiest hour

Example busiest hour: 65 gallons. Fixtures at once: 3.25 gal/min at a 70°F rise. Cold water: 50°F.

Cold water

Type the temperature of your cold water.

Models that cover your hour and flow

Water heater types at the example hour and flow
Type	Hot water measure	Models
Gas storage	65 gallons in the first hour	629 of 763
Electric storage	65 gallons in the first hour	95 of 505
Heat pump	65 gallons in the first hour	365 of 481
Gas tankless	3.25 gal/min at a 70°F rise	451 of 487
Electric tankless	3.25 gal/min at a 70°F rise	6 of 337

Only models with a certified flow figure count in the tankless totals.

Tank water heaters

Gas storageElectric storageHeat pump

Low draw pattern · 187 models

Medium draw pattern · 815 models

High draw pattern · 715 models

Tankless water heaters

Gas tanklessElectric tankless

Very small draw pattern · 274 models

Low draw pattern · 9 models

Medium draw pattern · 79 models

High draw pattern · 400 models

Tank or tankless, for your household

Your busiest hour

Models that cover your hour and flow

Tank water heaters

Tankless water heaters

Not covered