The instant water heater is a type of water heater that heats water in real-time. It heats only the water that passes through it at that moment. 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, as there is no water tank and no accumulation of salts in 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 heating element, gets heated, and exits through the hot water outlet pipe. A necessary condition for the instant water heater to initially function is 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 needing 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 liters per minute. Indicatively, 38-42 °C degrees are standard for shower use.

• It is small in size and does not take up much space.
• There are no energy losses, as only the water being used at that moment is heated. Therefore, we save on the electricity bill. In a traditional water heater, the hot water that is not used goes to waste.
• 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 also save water, in addition to electricity.
• There is no need to wait for the water to heat up. As soon as we turn on the tap, hot water flows in a few seconds. The 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.