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Circulation pumps. Heat pump installations, heat pump apparatus, heating installations, unit heaters, ventilating installations, apparatus for ventilating, water conduits installations, apparatus for supplying water, steam generating installations, steam generating apparatus, specifically, oil burners, gas burners, dual fuel burners, non-electric parts of the aforesaid goods; air-conditioning installations; heating plants, mainly consisting of boilers, oil, gas or dual-fuel burners and/or solar collectors, heat accumulators, hydraulic distributors, and parts therefor; igniters; hot water tanks and boilers; heat pumps, specifically air-to-water heat pumps, monoblock heat pumps and parts of the aforesaid goods; ventilating installations; ventilating fans, parts of the aforesaid goods; cogeneration power installations, and parts therefor; water heaters, mainly consisting of heat exchangers and reservoirs; expansion vessels, buffer storage units, range or insulating boiler, storage water heaters and parts of the aforesaid goods for heating installations.