• The electrical power of the boiler is not high, no more than 2 kilowatts (kW). During the heating process, the entire amount of water in the boiler heats up to the required temperature, and then it remains hot in a thermos-type tank.
• It is recommended to choose the volume of the boiler depending on the number of people who use it, as well as the water usage habits.
• Likewise, a boiler should be chosen with a thicker tank wall – the thicker it is, the better thermal insulation and less heat loss. It is recommended to choose a water heater with an eco-function, which allows you to maintain a minimum water temperature even when hot water is not being consumed.
• It should be taken into account that, for example, the boiler will require additional space, which could be an important aspect if the room is small. The boiler's electricity consumption depends to a large extent on both the set water heating temperature and the volume of the tank.
• When researching the selection of electric water heaters, you should pay attention to the energy efficiency class – the higher it is, the less electricity the water heater will consume.

Energy Labels

• The energy label is awarded to a hot water boiler that uses a fossil or biomass fuel, or an electric heating element, such as a hot water boiler.
• The declared load profile of the water heater indicates the load profile at which the energy efficiency class (from 3XS to XXL) has been specified by the manufacturer. It includes the frequency and quantity of daily water consumption, water temperature and other parameters.
• 3XS and XXS water heaters are suitable for small offices or hand washing. XS and S heaters will be useful for larger offices or for washing dishes and hands. M–XXL heaters are suitable for household needs. The higher the load profile, the more suitable the heater is for households with a larger number of occupants.

Use of a water volume heater:

• The water heater should be placed as close as possible to the place of water use.
• The water heating temperature should be set between +55 °C and +59 °C. Exceeding this temperature, limestone begins to be released more actively, thus the heating element of the water heater becomes limescale faster and its electricity consumption increases.
• At least once a year, the water heater must be serviced, during which the heating element is cleaned, the inside of the heater is thoroughly rinsed, and the condition of the anode is assessed. If the anode is broken, it must be replaced. Otherwise, the heating element will scale faster, increasing the water heater's electricity consumption.
• Before cleaning, the volume water heater must be disconnected from the electricity and water supply. It is preferable to entrust the maintenance of the water heater to a specialist.
• In order to keep the water hot all the time, the boiler periodically consumes electricity during the day. In standby mode, it can consume 1 kWh of electricity per 24 hours. It is recommended to turn off the boiler on holidays.