(under subclass 565) Subject matter wherein the stationary tank is used to hold water while it is being heated for use as hot water (e.g., for bathing) or for providing steam (e.g., to heat a building).
SEE OR SEARCH THIS CLASS, SUBCLASS:
694.1, for an external covering for a hot water heater or boiler, and
592.24, for a thermally insulated container wherein the insulation forms a removable outer jacket.
SEE OR SEARCH CLASS
122, Liquid Heaters and Vaporizers, appropriate subclasses, for a water heater or boiler which comprises a closed water-containing chamber or receptacle combined with a heat source.
126, Stoves and Furnaces, 344+, for an open water heater or boiler combined with a heat source.
