What is a tankless hot water heater?

Tankless water heaters heat water directly without the use of a storage tank. When a hot water tap is turned on, cold water travels through a pipe into the unit. Either a gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water.

What is hot water on demand?

Tankless water heaters, also known as demand-type or instantaneous water heaters, provide hot water only as it is needed. They don’t produce the standby energy losses associated with storage water heaters, which can save you money.

What is the most energy efficient water heater?

Tankless (On-Demand) Water Heater. Rather than storing water, tankless water heaters use heating coils to heat the water as you need it. They’re more energy-efficient than a storage tank, but provide only a limited flow of hot water per minute—about 3.5 gallons.

How long does it take for a hot water heater to heat?

A 50-gallon water tank will require about 20 minutes to refill and another 20 minutes to heat (call it 60 minutes to be safe). So if Uncle Bob drains all of your hot water, plan on waiting an hour before taking your turn.