I’ve finally removed the bubbler from under the boat today. The bubbler has been under the boat all winter season long and is essentially just a large fan circulating the water. The bubbler is strung under the boat with 2 lines and aimed up toward the surface. The motion of the water keeps the ice from freezing on the surface around the hull. This has been a mild winter so it worked out just great. The winter season before was quite tough and there were many nights in february where the temperature dropped so low, the bubbler could not keep up. There are a few brave neighbours who opt out of running a bubbler altogether and let the hull freeze over solid into the ice. The theory around that is the angled slope of the hull will make the boat slide up and out of the water (up to 4 inches last year) rather than crushing the hull. I don’t know how strong my hull is so I choose to keep the water around the boat clear.