21 ELECTRIC BUILT-IN WALL HEATERS; ELECTRIC AUTOMATIC HEATERS; ELECTRIC PORTABLE HEATERS; COMBINATION ELECTRIC CEILING HEATER-LIGHT-VENT APPARATUS; ELECTRIC HEATING CABLES; ELECTRIC BASEBOARD HEATERS; ELECTRIC FURNACES, ELECTRIC UNIT SPACE HEATERS; ELECTRIC CEILING HEATING PANELS; RADIANT HEATERS; THERMAL MATS; SNOW MELTING CABLE; AND ACCESSORIES RELATING THERETO