The World’s only energy efficient pond heater! ThermoPond is a unique patented pond heater that keeps a hole through the ice in backyard ponds for just pennies a day. In fact, ThermoPond can save up to 30.00 a month in electricity! Just think, ThermoPond pays for itself in as little as 2 months. That’s important, especially with today’s soaring energy prices and in some cases, shortages. ThermoPond floats on top of the water and is thermostatically controlled to never get hot. Unlike some other heaters, ThermoPond will never burn a pond liner or plastic pond. It naturally allows the pond to ice over while maintaining a hole through the ice. The hole in the top of the ThermoPond helps allow toxic gasses to escape all winter long. Allowing that gas exchange can help keep a healthier environment during the winter months ThermoPond should be used in ponds that are deep enough to allow plenty of livable water under the iced portion of the pond. ThermoPond has been tested in the Northwoods of Wisconsin at temperatures dipping down past 30 below Zero Fahrenheit. UL and CUL listed.