Instant hot water dispensers used in kitchen sinks are quite different from tankless instant hot water dispensers. It is a small point-of-use water heater that can supply enough hot water to a water fixture such as a bathroom sink. It works by heating water flowing through the device, similar to the working principle of a whole-house instantaneous water heater system. The device itself is compact and does not include a bulky storage tank. For the system to work, there is a separate connection to the water supply; another connection brings hot water directly to the faucet.
Since these units are compact, you can store the heater directly underneath the sink. These units also help save water as well as electricity. If you live in a large house with a high demand for hot water at different points of use, you will benefit from a tankless instant hot water dispenser system where you don't have to wait long for hot water to reach the sink.