The instant water heater has an input pipe for cold water, which passes through the heating element, heats up, and comes out in the output pipe for hot water. A necessary condition for the instant water heater to initially operate is the pressure of the input cold water should not be too low.
The temperature of the water is regulated by a thermostat, so that it does not exceed a maximum value. 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 55 °C, while the maximum flow rate of the water reaches up to 7 liters per minute. As an indication, 38-42 °C degrees are the standard for shower use.