Air-conditioning installations; Air cooling apparatus; Air filtering installations; Central heating radiators; Cooling installations for water; Gas purification machines; Gas stoves; Heating boilers; Heating installations; Heating systems composed primarily of tubes, pipes and manifolds through which warm or high temperature water circulates; Heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates; Humidifiers for central heating radiators; Pipes for heating boilers; Radiators; Solar collectors; Solar water heaters; Space heating apparatus; Water heaters; Water purifying apparatus and machines; Water treatment equipment, namely, water filtration units; Air purifiers; Electric air driers; Faucets for pipes and pipelines being parts of sanitary installations; Gas water heater for bathtub consisting of circulation pump with thermostat to fill, re-heat water and keep water warm; Hot water heating installations; Hot-water space heating apparatus; Industrial cooling apparatus, namely, compax coolers; Pool skimmer diverter; Regulating accessories for water supply, namely, metered valves; Safety accessories for gas pipes, namely, flashback arrestors and reverse flow check valves; Sauna heater rocks; Swimming pool skimmer flow diverting weir for increasing the amount of debris drawn into the skimmer