I once seen a hole heater made out of a tin coffee can.It was in a hard cover ice fishing book. It had a copper tubing coiled inside the can that came out the side of the can and sat in the water. When heated the water was sucked in the tubing and warmed as it passed through, and back into the hole. This kept the surface temp above freezing and also kept the water moving to stop it from freezing up. I have been looking for this book, or the plans on how to make one. Has anyone seen this, know the name of the book, or have the plans to make one??? THANKS!!!!
ICHASER