water heaters being parts of machines

electric hot water dispensers; electric water heating apparatus; instantaneous water heaters; gas fired water heaters; gas water heaters; gas water heaters for household purposes; gas water heaters for household use; water heaters for household purposes; water heaters for household use; water heaters for industrial purposes; water heaters for industrial use; water heaters; water heaters with air heat pump; water heaters with air heat pumps; storage water heaters