A tankless water heater, likewise understood as an on-demand water heater, is a sort of water heating unit that warms water simply when it is actually required. Unlike typical hot water heater that hold and warm a large amount of water in a container, tankless hot water heater warm the water straight as it flows by means of the device. This offers warm water promptly as well as gets rid of the necessity for a storage space tank, sparing space as well as power.