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A boiler system can be set up with primary and secondary loops to supply hot water for multiple uses
A Category I induced draft boiler uses an induced draft fan to pull air through the combustion chamber and to the flue
Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside
Category III oil-fired, sealed-combustion boiler with the burner assembly cover removed
In a Category I gas-fired, natural-draft boiler, the natural draft of the heated flue pulls combustion air through the draft hood into the combustion chamber