chemical feed systems sold as a unit consisting of pump motors, agitators for circulating liquid, chemical tanks, frames and supports for the system, gauge glass, valve fittings, strainers for drains and liquid lines, valves for regulating boiler and boiler pipe pressure, boiler pipes and boiler pipe lids, and parts for all of the foregoing

diagnostic annunciators for use on industrial burners and boilers; computerized and non-computerized burner controls, computerized and non-computerized boiler controls, temperature controls, and programmable logic controllers for use on industrial boilers and burners; oxygen trim systems consisting of oxygen trim sensors, temperature and pressure controls and annunciators for use with combustion equipment, namely, industrial burners and parts therefor; industrial burner control systems sold as a unit consisting of oxygen trim sensors and controls, burner controls and boiler controls and parts for all of the foregoing

boiler feedwater systems sold as a unit consisting of water receiving tanks, boiler pumps, pump control valves, valves for boilers, motors for boilers, boiler piping, gauge glass, thermometers, gauges, siphons, shut-off cocks, starters and switches, programmable logic controllers for feedwater systems, and parts for all the foregoing; industrial boilers used to generate steam and hot water; ion exchange equipment consisting of water softening and conditioning units for industrial use, dealkalizers, demineralizers, draft control systems, water filtering units for industrial use and parts for all of the foregoing; deaerators for use on industrial boiler systems; blowdown heat recovery units consisting of heat exchangers for chemical processing, surge tanks, flash tanks, industrial boilers, water coolers, parts for all of the foregoing and temperature controls; industrial steam and water separators, heat transfer liquid heaters; fuel economizers for use with industrial boilers sold as a unit and comprised of a pressure vessel, combustion stack, hot structure, heat exchanger, sootblower, valves for regulating boiler steam and pressure, and thermometer, and parts therefor