| 摘要 |
A heat exchanger coil disposed in a furnace chamber or duct to absorb heat from the furnace to increase the temperature of water passing through said coil from a cold water source to a hot water heater or storage tank is disclosed. An additional feature includes a second heat exchanger coil disposed between the cold water source and the furnace heat exchanger within the confines of a building to absorb heat from the ambient surroundings. An insulated coiled storage unit disposed downstream of the furnace heat exchanger to provide a quantity of additional preheated water to the water heater and a spurge tank overheat and overpressure relief unit for the system is also disclosed.
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