Which type of water heater heats water as it passes through a heated coil?

The type of water heater that heats water as it passes through a heated coil is known as an instantaneous water heater. This system is designed to provide hot water on demand without the need for a storage tank. When a tap is turned on, cold water enters the unit and is immediately heated by a coil that is warmed by a gas flame or electric elements.

This technology allows for continuous hot water supply, meaning that as long as there is a cold water source and the heating capacity is sufficient, you can receive a continuous flow of hot water. Instantaneous water heaters are particularly efficient because they do not store hot water — which results in less energy consumption compared to storage water heaters, which keep a predefined amount of water hot at all times.

The capability of instantaneously heating water without waiting for a storage tank to fill or relying on pre-heated water is what distinguishes this type of water heater and positions it as an excellent option for homes and businesses wanting an efficient and space-saving solution for hot water needs.