The energy label applies to a hot water boiler that uses a fossil or biomass fuel, or an electric heating element, such as a electric 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 amount of daily water intake, water temperature, and other parameters.
3XS and XXS water heaters are suitable for small offices or hand washing. XS and S heaters are suitable 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 for households with a larger number of occupants.