Apparatus for heating and cooling air and water; apparatus for water supply; apparatus for air handling and supply for heating, cooling and spas; swimming pool and spa filters, heaters, heat exchangers, chlorinators, salt chlorinators, valves, fittings, fixtures and apparatus in this class; sand filters for water; heat pumps; water and gas valves; heaters; gas heaters; electric heaters; heat exchangers; heating and hot water boilers; apparatus for hydronic heating; hydronic heaters, radiators, valves, fittings, fixtures and apparatus in this class; apparatus for lighting, underwater lighting, fibre optic lighting