Our heating system 18. March 2020 Alex-Pulice Energy knowledge, VZ19A (0) My apartment is heated by a boiler. They are very environmentally friendly and therefore often pay for themselves after a short time. The boiler heats the water to the preset temperature and stores it. The advantages of a hot water boiler are the use of the heating system and in addition, several taps can be operated at the same time. As a guideline, one can assume 500 kWh electricity consumption per person and year. With an electricity price of 33 cents per kWh, this means annual costs of 165 euros.