Am building a NEW cabin, and have consolidated all of the utilities into a small (4' X 8') space under the cabin. We suffer many power outages, ranging from 10 hours to 10 days, and when I deploy my generator for the basics (Refrigerator, freezer, lights,etc.) I would like to be able to use the excess power generated (and not used) to heat this crawlspace area. Not just the pipes but the entire area. I see they have "electric pads" and also electric "in-floor" heating.
So my thinking is: Install electric pads on TOP of a 4' by 8' by 2" blue/pink board insulation, set sand & small rocks on top, to create a heat tank under the liquid utilities. Note: the crawl-space is fully enclosed, and insulated with 2" thick Polystyrene (Dow'board).
Does anyone have experience with these (in-ground/concrete) heat-pads, good or bad........?