Due to the high performance of the building envelope, and in particular air tightness the building does not have a conventional gas boiler and central heating system. Instead each apartment has a dedicated Nilan VP 18 active heat recovery unit for extracting hot, humid air from kitchens, bathrooms and cloakrooms. Dust particles, moisture and smells are thus removed from the dwelling, ensuring a comfortable indoor climate.

The energy recovered from the extracted air is used to provide domestic hot water and to heat the incoming air. The VP 18 also has a cooling system, allowing the unit to cool the incoming air. The energy contained in the incoming air is utilised for water heating before the cooled air is used to ventilate the dwelling. “Free” air cooling is therefore provided whenever the water requires heating.