Gas water heaters for household purposes; gas water heaters for industrial purposes; gas water heaters; heating, steam producing, cooling, drying, ventilating, water supply and hot water supply devices operated by heat-pump system for household purposes; heating, steam producing, cooling, drying, ventilating, water supply and hot water supply devices operated by heat-pump system for industrial purposes; heat pumps; electric water heaters for household purposes; electric water heaters for industrial purposes; water heaters; water heaters for household purposes; water heaters for industrial purposes; boilers, other than parts of non-electric prime movers or engines; hot water storage tanks for heating, steam producing, cooling, drying, ventilating water supply and hot water supply devices; hot water storage tanks for heating and hot water supply devices for household purposes
Environmental Control Apparatus