An on-demand tankless water heater heats water only when you need it. Unlike a traditional hot water tank that constantly stores and reheats water, a tankless system activates the moment you turn on a hot water tap. Cold water flows through the unit, where a powerful gas burner or electric heating element quickly heats it before delivering it directly to your faucet, shower, or appliance.

Because there is no storage tank, you’ll never run out of hot water due to an empty tank. As long as the system is properly sized for your home’s demand, you can enjoy continuous hot water for showers, laundry, dishwashing, and more.