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

It operates on electricity and is single-phase.

The instant water heater has a cold water inlet pipe, which passes through the heating element, heats up, and comes out in the hot water outlet pipe. A necessary condition for the instant water heater to initially operate is that the pressure of the cold water inlet is not too low.

The temperature of the water is regulated by a thermostat, so as not to exceed a maximum value. The temperatures reached by the hot water are pre-set so that someone can use the hot water directly, without the need for mixing with cold water.

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

• It is small in size and does not take up much space.
• There is no energy loss, as only the water that is being used is heated at that moment. Therefore, we save on electricity bills. In a traditional water heater, the unused hot water goes to waste.
• The hot water used in the instant water heater is used as is, without mixing with cold water, as in a traditional water heater. This also saves water, in addition to electricity.
• We do not have to wait for the water to heat up. As soon as we turn on the faucet, hot water comes out in a few seconds. A traditional water heater takes some minutes, depending on its size.
• The hot water never runs out. As long as we have the faucet open, we will have hot water.