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Typically, during light freeze conditions, circulating (moving) water will not freeze. In areas where freezing conditions are prevalent and sustained, the heat pump must be winterized as follows: 1) Disconnect all electrical power to the heater; turn off circulating pump. 2) At the two (2) connection unions, disconnect the plumbing to the heater (removal is counter-clockwise). 3) If your unit has an external drain plug, remove plug. This plug would be located at lower, front corner of heater (po