Patent ID: 7575001

Claim:
An electric forced air hydronic furnace for heating water for an on-demand hot water supply system and operatively connected to a cold water supply and a recirculating air flow through a continuous air duct system, comprising: a) a heat pump; b) a first hear exchanger having a condenser coil; c) a second heat exchanger; d) a blower; and e) a controller; wherein said heat pump has a first heat exchange element; wherein said heat pump includes said condenser coil; wherein said condenser coil emits heat; wherein said first heat exchanger receives air from an inlet; wherein said first heat exchanger includes said condenser coil of said heat pump as a heat source; wherein said second heat exchanger receives air from said first heat exchanger; wherein said second heat exchanger includes a hydronic heat exchanger coil through which flows water to be heated so as to allow the air to be heated in said first heat exchanger and to reject heat to the water in said second heat exchanger; wherein said blower is for forcing the recirculating air through said first and second heat exchangers and through the air duct system; and wherein said controller operates said heat pump when heat is needed to heat the water in said second heat exchanger.