| 摘要 |
A supplementary hot water heating system which transfers to a hot water tank heat from exhaust gas in the furnace stack which would otherwise be wasted. When the water in the supplementary heater core is heated to a desired temperature, normally closed valves, one connecting the heater core to the cold waterline and the other connecting the bottom of the hot water tank to a drain, are simultaneously opened and remain opened until the supplementary heater core is again filled with cold water from the cold water line.
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