Heat pumps; Heat pumps for energy processing; Pressure water tanks; Heat accumulators; Hot water heating installations; Installations for heating swimming pools; Storage heaters; Bath installations; Drying installations; Underfloor heating apparatus and installations; Apparatus for the space heating of commercial premises; Apparatus for domestic heating purposes; Heating apparatus; Hot water supply heaters; Water heaters; Swimming pool heaters; Bath tubs; Spa baths; Hot tubs; Water chillers