• Due to the compact size of the heater, the device can be easily hidden in an interior. The water is heated instantly – when you open the water faucet, hot water flows immediately. There is no heat loss, because the water is not continuously kept hot in the tank, as it is in a boiler.
• So, this water heater is more efficient than the boiler, but it has a limitation – the high electric power. Therefore, a three-phase electricity connection and the current size of the input protection device should be at least 25 amperes (A). It is usually not possible to install it in places where there is only a single-phase connection.

• In order not to waste electricity unnecessarily, it is recommended to choose a flow-through water heater of appropriate capacity, but also make sure that the capacity is not too small, and that the heater is able to provide hot water at all water intake points. For example, in the water supply system, the cold water temperature is 10 degrees, we want to heat it to 40 degrees, so the temperature difference is 30 degrees. We also want the water flow to be large enough – 10 litres per minute. So we have a suitable instantaneous water heater with a capacity of 21 kW.

• Water heating (if used) is a significant source of office costs. It usually accounts for about 7% to 12% of electricity costs.

There are four ways to reduce water heating costs

1. Use less hot water.
2. Reduce the temperature of the water heater thermostat.
3. Insulate the volumetric water heater or boiler.
4. Get a new, more efficient heater model, such as a tankless heater.