Filters for fluids, namely, for water and area-water solutions; Filters for water filtering apparatus; Heating elements; Heating installations; Hot tubs; Jet nozzles for bathtubs; Sauna heaters; Saunas; Spas in the nature of heated pools; Air-source heat pump water heaters; Component parts of water cooling towers in the nature of wire mesh hangers for securing slat fill; Drain structures for use in spas, steam rooms and baths; Electrical induction heating apparatus for heating metal workpieces; Equipment for treating groundwater and soil comprising distribution lines, distribution manifolds, drop tubes, well seals and blowers; Filters, heaters and pumps sold in combination for use in spa, hot tubs and swimming pools; Filters, heaters and pumps sold in combination for use in hot tubs; Filters, heaters and pumps sold in combination for use in swimming pools; Fitted spa covers; Fitted liners for hot tubs or spas; Gas water heater for bathtub consisting of circulation pump with thermostat to fill, re-heat water and keep water warm; Heat pumps; Heaters for hot tubs; Heating systems composed primarily of tubes, pipes and manifolds through which warm or high temperature water circulates; Heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, solar panels, control panel, switches and electrical wire, all sold as a unit; Hot tub filters; Hot tub heaters; Hot water heaters; Hybrid water heater; Plumbing fitting, namely, vacuum release safety valve for flow shutoff in pools and spas; Sauna heater rocks; Swimming pool drain covers; Swimming pool water cleaning and filtering units; Swimming pool heaters; Water filtering apparatus; Water filters; Water heaters; Water jets for use in spa, hot tubs and swimming pools; Water bed heaters