It will turn on at 38 degrees and off at 43 degrees
Yes you can use under your Manufactured Home.
No because it cannot be used outside since it is not a waterproof product. The thermostat would not work exposed to windchill.
It will get up to approx. 88 degrees, warm to the touch.
No, it is not made to get wet. It should not be used to stop standing water from freezing, and besides it would not work.The sensor has to be against the water pipe in order for it to even come on.
No. In this case 2 is not better than one.
No, heat cables are like indoor extension cords, they cannot be used outdoors where water can get to the cable. The thermostat will not get an accurate reading when outdoors and pipes could still freeze. Never use outdoors in unprotected areas.
No because it will not work. The cable is not made to work outside.
You could but the sensor and thermostat is only going to sense one pipe and the other could freeze.
You will only draw 0.5 amps.