I am having a water flow problem. I have heat tape from my well to the cabin. Most of the cabin is up off the ground on pillars. There is one approx. 8'x8' - 42" inch high fully enclosed, insulated utility chase under the bathroom and that is where the water comes in. The chase isn't heated but there is an open grated 3'x3' area to the bathroom. I am not getting nearly enough heat down there to keep the pipes from freezing. I have resorted to putting a propane heater down there as a short term solution. Would applying heat tape to the interior water pipes (they are not copper but some type of plastic type material) be possible? If so should they then be insullated? If I call in a professional should I call a plumber or an electrician to do this? Any other suggestions are appreciated.