I kept a hole open all winter with:
small maxi 1000 water pump with hose running water just over one of those flat
aluminum bird bath heaters http://www.mu.edu/~buxtoni/mypond/wi...ondheater.html
the pond is a small preformed 220 gallon.
I have kept a hole open with two large round airstones on a kmart double outlet air
pump positioned right above a 100 watt heater.
my problem is when the electricity goes out. that is why I went to the covered pond.
then I decided I didnt like my fish going without food that long. that is when I
bought the 500 watt.
now AES is on BACK ORDER. !!!!!
Ingrid

(MC) wrote:

A bubbler won't do anything in really cold weather. The water freezes.
Even running a waterfall, it will freeze in really cold weather.

A 300 watt heater will raise the water temp 10 degrees for a 300
gallon pond as a rule of thumb. I am planning on 2 300 watt heaters.
That should raise the temp about 15-20 degrees with the solar cover.
I would expect at 30 inches below ground with the ground acting as an
insulater, It will keep the temp above 40.



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