The instant water heater has a cold water inlet pipe, which passes through the resistance, 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 an upper limit. The temperatures that the hot water reaches 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 11 liters per minute. As an indication, 38-42 °C degrees are the standard for shower use.