What Is a Tankless Water Heater? Tankless water heaters take up much less space than storage water heaters as they heat the water directly. When you turn on the hot water, the cold water travels through a pipe and into the tankless water heater unit where it is heated by a gas burner or an electric element.

Water heaters offer hot running water at the turn of a faucet. But, a water heater can only take so many hot showers, warm baths, and steamy dishwasher cycles before it needs to be replaced. Conventional water heaters use tanks to hold preheated water,