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...