Hi all, can anyone offer me any advice as my sower pump is located in the loft and keeps freezing. The manufacturer is being no help and two pumps have frozen and the sensors broken so needed replacing. As they are electric motors I am reluctant to cover them in insulation products. I have thought about a mdf box with a small heater that triggers when the temp drops but this seems overkill. Are there any pumps designed for colder environments? Any help welcome! Thanks.