The instant water heater is a type of water heater that heats water in real-time. It only heats the water that passes through it at that moment. This means there is no hot water storage tank. This has many advantages, such as energy savings, since only the water that is used is heated, and longer lifespan, since there is no water tank and no accumulation of salts on the resistance and other components.

It operates with electricity and is single-phase.

The instant water heater has a cold water inlet pipe, which passes through the resistance, heats up, and exits through the hot water outlet pipe. A necessary condition for the instant water heater to initially operate is that the pressure of the incoming cold water should not be too low.

The water temperature is regulated by a thermostat, so it does not exceed a maximum value. The temperatures that the hot water reaches are preset so that one can use the hot water directly, without the need to mix it with cold water.

The maximum temperature that can be reached for hot water production is 60 °C, while the maximum water flow rate reaches up to 4.5 liters per minute. Indicatively, 38-42 °C degrees are standard for shower use.

• It is small in size and doesn't take up much space.
• There are no energy losses, as only the water being used is heated at that moment. Therefore, we save on the electricity bill. In a traditional water heater, the hot water that is not used is wasted.
• The hot water used in the instant water heater is used as is, without mixing with cold, as happens in a traditional water heater. Thus, we save water as well as electricity.
• There is no need to wait for the water to heat up. As soon as we turn on the tap, hot water runs in a few seconds. A traditional water heater takes a few minutes, depending on its size.
• The hot water never runs out. As long as we have the tap open, we will have hot water.