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Message: [QUOTE="MitchM, post: 258326, member: 4402"] It's a very expensive method to expose pond water to the surrounding air - passively at that. I prefer to use a pond breather which constantly circulates water from 2 feet below the surface and exposes the water to the air in a heated tube. The floating heater uses as much as 1500 watts, the pond breather uses 48 watts. Pond breather: [URL]http://www.amazon.ca/Watt-Pond-Breather-Heated-Aerator/dp/B000HHM9U0[/URL] The only useful purpose a floating heater provides (in my opinion) is that it creates an open water area so that a person can view their fish. The gas exchange aspect would be minimal I believe. [/QUOTE]