| 摘要 |
A circuit board controller enables a solar hot water system to be used in conjunction with, and assist, a conventional heating system such as a furnace. If some heat is available from solar heating, then the solar heat is used for pre-heating so the conventional heating system does not have to perform as much work. If there is enough heat available from solar heating to provide all of the heat that is needed, then operation of the conventional heating system is locked out.
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