Patent ID: 8459569
Filing Date: 2013-06-11
Classification: F23B,F24B

Abstract:
1. A heating unit located within an interior space including a first set of rooms and a second set of rooms, the second set of rooms not having any rooms in common with the first set of rooms, comprising: a primary heater for generating primary combustion gases; a heat exchanger including: a first fan for drawing the primary combustion gases and the exhaust air through the heat exchanger, and for exhausting the primary combustion gases and the exhaust air outside the interior space; a second fan for drawing in the return air from the first set of rooms or fresh air from outside the living space, and for blowing out the supply air into the first and second rooms; and a controller for switching between a heating mode in which the primary combustion gases heat the return air, and a heat recovery mode in which the exhaust air heats fresh air.