11 Apparatus and installations for heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes, namely, electric space heaters, steam generators, cooking stoves, refrigerators, clothes dryers, ventilating exhaust fans, filters for use with apparatus for water supply, and pressure regulators for sanitary installations; safety accessories for water and/or gas apparatus and water and/or gas pipes, namely, flashback arrestors and reverse flow check valves; solar energy fan heaters; solar energy water heater; solar powered torches for lighting; solar energy lamps; solar heating panels; heating elements; heat pumps; heating boilers and structural parts therefor