Had a major problem and finally got it fixed. Replaced the crappy 3 wrap underground pipe I purchased and replaced it with logstor, what a major difference !!! The repair job was expensive, had to rip out 2 sections of sidewalk, drain the furnace, rent a jackhammer, backhoe, and a forklift to pick up the furnace, dug up 75 ft. ditch to remove the crappy 3 wrap pipe, bought 6 ton of screening in witch I put a 8 inch layer down first, installed the new logstor and covered that with about 8 inches of screening. The total repair cost me around $2000. bucks !!! When I removed the 3 wrap it was waterlogged, the insulation crumbled apart like dry leaves. I new I had a major problem last winter when the furnace ran constant and when it did snow I always had a 75 ft. clear path where the 3 wrap pipe was installed and I had it buried 3 ft. deep. My neighbor's though I shoveled a path out to the furnace, that's how much heat I was losing. This logstor pipe is amazing, the furnace is fired up and up to temp at 180, no leaks. They shouldn't even sell that 3 wrap crap !!! I hope other people don't make the same mistake I did, buy logstor!