Air-conditioning apparatus and installations; Air-source heat pump water heaters; Air humidifiers; Drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; Energy storage plants; Gas water heater for bathtub consisting of circulation pump with thermostat to fill, re-heat water and keep water warm; Heat accumulators; Heat pumps; Heaters for swimming pools; Heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates; Hot-water space heating apparatus; Hot tubs; Hot water heating installations; Hot water tanks; Hydroponic water chillers; Interior environment control system for commercial buildings, namely, heaters, ventilators and humidifiers all sold as a unit; Refrigerating appliances and installations; Sauna bath installations; Underfloor heating apparatus and installations; Water heaters