Patent ID: 6953335

Claim:
Flueless, low nitrogen dioxide-emitting heater comprising: a heater body; a burner for burning a fuel to produce fumes comprising nitrogen oxide, said burner being positioned in said heater body; a fuel supply for supplying said burner with said fuel; an igniter for combusting said fuel; an evacuator for discharging into an environment exterior to said heater body, said fumes comprising nitrogen oxide, produced by combustion of said fuel; a heat-exchanger positioned between said burner and said evacuator for providing heat-exchange with said fumes in such a way as to lower a temperature of said fumes from a first temperature through progressively lower intermediate temperatures to a final temperature that is below a minimum temperature at which nitrogen oxide (NO) in said fumes is capable of being converted into nitrogen dioxide (NO 2 ), in order to minimize a final NO 2 content of said fumes when said fumes are discharged from said evacuator into said environment exterior to said heater body.