BOILER FEEDWATER SYSTEMS CONSISTING ESSENTIALLY OF RECEIVERS, PUMPS, CONTROLS, VALVES, PIPING, MOTORS, GAUGE GLASS, THERMOMETERS, GAUGES, SIPHONS, SHUT-OFF COCKS, STARTERS AND SWITCHES, ALL SOLD AS A UNIT, AND PARTS FOR ALL THE FOREGOING; CHEMICAL FEED SYSTEMS CONSISTING ESSENTIALLY OF PUMPS MOTORS, AGITATORS, TANKS, FRAMES, SUPPORTS, GAUGE GLASS, VALVE FITTINGS, STRAINERS, VALVES, PIPES AND LIDS, AND PARTS FOR ALL OF THE FOREGOING

DIAGNOSTIC ANNUNCIATORS, COMPUTERIZED AND NON-COMPUTERIZED BURNER CONTROLS, COMPUTERIZED AND NON-COMPUTERIZED BOILER CONTROLS AND TEMPERATURE CONTOLS; OXYGEN TRIM SYSTEMS CONSISTING OF OXYGEN TRIM SENSORS, CONTROLS AND ANNUNCIATORS FOR USE WITH COMBUSTION EQUIPMENT, AND PARTS THEREFOR; BURNER CONTROL SYSTEMS CONSISTING ESSENTIALLY OF OXYGEN TRIM SYSTEMS, BURNER CONTROLS AND/OR BOILER CONTROLS AND PARTS FOR ALL OF THE FOREGOING

BOILERS INCLUDING THOSE USED TO GENERATE STEAM AND/OR HOT WATER; [ FLUID PURIFICATION, SEPARATION AND/OR CONCENTRATION UNIT UTILIZING MEMBRANE PROCESSES AND PARTS THEREFOR; ] ION EXCHANGE EQUIPMENT CONSISTING ESSENTIALLY OF WATER SOFTENING AND CONDITIONING UNITS, DEALKALIZERS, DEMINERALIZERS, WATER FILTERING UNITS AND PARTS FOR ALL OF THE FOREGOING; INDUSTRIAL BURNERS; DEAERATORS; BLOWDOWN HEAT RECOVERY UNITS CONSISTING ESSENTIALLY OF HEAT EXCHANGERS, SURGE TANKS, TEMPERATURE CONTROLS, FLASH TANKS, BOILERS, WATER COOLERS, AND PARTS FOR ALL OF THE FOREGOING; INDUSTRIAL STEAM AND WATER SEPARATORS; HEAT TRANSFER LIQUID HEATERS; FUEL ECONOMIZERS FOR USE WITH BOILER SYSTEMS COMPRISING ESSENTIALLY A PRESSURE VESSEL, COMBUSTION STACK, HOT STRUCTURE, HEAT EXCHANGER, SOOTBLOWER, VALVES, AND THERMOMETER, AND PARTS THEREFOR