My regime is slightly different than Kien's. I take the styrofoam out of the floating deicer heater and let it sink to the bottom. It only kicks on at 7c. Then I run an airstone on the first shelf 2 ft away from the heater which brings the warmer water up. I keep the air pump in the shed and cover in with a large Rubbermaid container and blanket so that the heat that the pump generates stays in the Rubbermaid and gets pumped to the pond. I do not run a water pump. When it gets really cold, I will shovel snow onto the frozen surface to help insulate the whole pond. This has worked well for the past 2 winters since I've had my big pond.
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