This invention relates to space heating equipment generally, but more particularly to a flue gas heat recovery system for use in conjunction with a forced hot air home furnace. Most such furnaces are grossly inefficient, primarily because of heat lost to the atmosphere through the flue. This constitutes a continuous loss of heat, but it occurs at an accelerated rate when the burner is in operation, at which time flue gas temperatures are at a maximum, ranging from 350 to 400 degrees Fahrenheit.
Fully cognizant of this situation, the applicant has developed a heat recovery system which reduces the flue gas discharge temperature to approximately 125 degrees Fahrenheit. As a consequence of this substantial decrease in the discharge temperature, fuel consumption is significantly reduced, and the operating efficiency of the furnace greatly improved. The applicant's heat recovery system thus conserves energy and appreciably reduces home heating costs.