Hot water storage tank
  1. Manufacturer and model
  2. Water storage function
  3. Energy efficiency class
  4. Permanent heat loss, in watts
  5. Water tank capacity, litres

The energy label applies to the internal unit of the air-to-air heat pumps that have a built-in water storage tank and are placed on the floor instead of being wall-mounted, as well as to other types of hot water storage tanks that do not have a built-in heat generator.