We have the heat pads and used them when the temperature remained in the 20s F for 3 days in the Dallas TX area last winter. We were on shore power but not connected to external water. I could tell the heating pads came on by reading the EMS current draw. We also kept cupboard doors open and the hot water heater on (due to the fresh water tubing going to the sink running under the trailer). We had no problems with our internal water. How much the heating pads contributed to our lack of problems, I don't know.
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Rick and Vicky Reed
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