Patent ID: 7850448

Claim:
A gas fired heating apparatus comprising: a) a plurality of burners, said burners grouped into at least first and second groups; b) a modulating gas control valve associated with said first group of burners, said modulating control valve connectable to a source of combustible gas and controlling the flow of combustible gas from said source to said first group of burners; c) a gas control valve associated with said second group of burners, said gas control valve connectable to a source of combustible gas and operative to control the flow of gas from said source to said second group of burners; d) a heat exchange tube associated with each burner and having an inlet and an outlet, said associated burner firing into an inlet of said associated heat exchange tube; e) a collector chamber communicating with outlets of said heat exchange tubes; f) said collector chamber divided into sections by a baffle member located in said collection chamber, one of said sections communicating with the outlets of heat exchange tubes associated with the first group of burners, another section of said collector chamber communicating with the outlets of heat exchange tubes associated with said second group of burners; and, g) an induced draft blower concurrently communicating with said sections of said collector chamber.