How They Work
Because the water is heated continuously as it flows through the heater, the supply of hot water from a tankless heater is unlimited except by the flow rate of the heater – and a standard tankless heater can provide more than 250 gallons an hour at 120 degrees. Compared to a standard residential storage tank style water heater, which will provide about 70 gallons per hour, it is easy to see why tankless water heaters are so popular now. In 99% of the installations, a single gas-fired tankless heater can provide enough hot water for your entire house.
Because tankless water heaters heat only the water that is being used instead of holding a reservoir of water at high temperature, they are very energy-efficient. And the small size of the heater can free up space you would rather use for other purposes. Whatever your HOT water needs, there’s a tankless water heater to fit the bill.