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I was finally able to replace my leaking 10K gallon water tank this year. When I attempted to reinstall the heat cable on the 4" inlet, I noticed it was broken. I went online to get a new one and noticed they all say they are for pipes 2" and thinner. Is it worth it to spiral run a heat cable around a 4" pipe, or should I just add 2" of fiberglass/closed-cell foam insulation and cover with 20mil pipe wrap? Since heat cable tends to overheat if covered by more than 1/2" of insulation, what if I limit the insulation on top of the sensor and add extra insulation on the rest of the cable?