Water Gardening: Looking for heater/deicer suggestions for 2000 gal pond, 0 by snapple45

snapple45 wrote:
This will be the third winter for our pond. We have kept two different kinds of deicers and an air pump going the previous two winters. The reason we kept three kinds going is that we were afraid one might fail at -20 temp. heavy snow and wind. Last winter one deicer did fail and the air line to the air pump froze from condensation. In mid Feb we were down to one deicer and one tiny little hole for a large surface area. I had to have a deicer overnighted from an online pond store and use heated water to melt the ice to get it in. We succeded but it wasn't fun. Are there any really reliable deicers or heaters? Should I try one that rests on the bottom instead? The pond has various depths, a pebble beach that slopes to 6 in and drops off to 2 ft, a 1ft level and a 3 1/2 ft.