如果在冬天泳池处于半运行状态，且过滤器的泵装有一个防冻温控器，则加热器内可以充满水。
If the pool is to be kept in semi-operation during the winter then the heater may only be left full of water.
如果在冬天泳池处于半运行状态，且过滤器的泵装有一个防冻温控器，则加热器内可以充满水。
If the pool is to be kept in semi-operation during the winter then the heater may only be left full of water.
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