Pond heaters are essential devices for maintaining stable water temperatures, particularly in colder climates. They help prevent the pond from freezing over entirely, allowing gas exchange that keeps oxygen levels stable and reduces stress for fish, such as koi, which are sensitive to temperature changes. By maintaining a consistent environment, pond heaters protect fish from cold sho... https://david-chips2.timeblog.net/66803968/understanding-the-importance-of-pond-heaters