820	STEAM AND HOT WATER BOILERS, STEAM HEATING, AND POWER PLANT EQUIPMENT
82004  *	After-Coolers and Condensers
82006  *	A.S.M.E. Code Tanks
82008  *	Boilers, High Pressure
82012  *	Boilers, Low Pressure
82016  *	Boiler Tubes
82020  *	Blow-Off Basins
82024  *	Blow-Off Valves
82028  *	Burners, Gas and Oil
82032  *	Chemical Feed Systems (For Proportioning Pumps See Class 720)
82036  *	Coils, Steam Heating
82038  *	Condensate Return Systems: Vacuum Heat Pumps, Wet Vacuum Pumps, etc.
82040  *	Controls: Combustion, Fuel Cut-Off, Hardness, High-Low Water Level, Ignition, etc.
82044  *	Convectors and Radiators
82048  *	Deaerating Units
82052  *	Draft Fans and Draft Gauges
82056  *	Feedwater Heaters
82060  *	Feedwater Injectors
82064  *	Filters, Boiler Water
82068  *	Heat Exchangers, Accessories, and Parts
82072  *	Hot Water Generators
82076  *	Oil Purifiers
82084  *	Stacks, Steel
82086  *	Steam Flow Transmitters
82088  *	Tube Cleaners and Tube Expanders
82092  *	Turbines, Steam Driven
82093  *	Turbines, Water (Hydraulic) Including Accessories and Parts
82095  *	Valves, Spherical