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air supply amount of heat anthracite appliances arranged ashpit bituminous coal boiler control boiler house boiler installations boiler operation boiler temperature building bunker burn burner carbon dioxide carbon monoxide cent central heating chapter chimney draught chimney stack circulation clinker coal feed cold feed combustion chamber complete combustion domestic boilers efficient combustion electric feed worm firebars firebed firebox firebrick fitted flow and return flow pipe flue damper flue gases flue passages forced draught fuel distributor gravity heat loss heat output heater heating and domestic heating system hopper hot water supply industry magazine boiler mechanical stokers mercury switch method motor-fan motorized valve natural draught necessary owing oxygen pressure radiators refuelling result return pipes room thermostat secondary air secondary circulation sections shear pin sizes solid fuel steam boilers storage cylinder switch take place tube type of boiler type of stoker underfeed stokers usually variostat