11 Boiler pipes for heating installations; Boilers for heating installations; Heaters for swimming pools; Hot water heaters; Hot water heating installations; Hot water tanks; Safety accessories for gas pipes, namely, flashback arrestors and reverse flow check valves; Space heating apparatus; Swimming pool skimmer flow diverting weir for increasing the amount of debris drawn into the skimmer; Swimming pool water cleaning and filtering units; Air heating apparatus for commercial use; Electric boilers; Electric space heaters; Electric water boilers; Electrical boilers; Filters, heaters and pumps sold in combination for use in swimming pools or hot tubs; Heating boilers; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel switches, and electrical wire, all sold as a unit; Hot-air space heating apparatus; Hot-water space heating apparatus; Pipes for heating boilers; Plumbing fitting, namely, vacuum release safety valve for flow shutoff in pools and spas