~Roy~ wrote:
Gill

What part of the country are you in? Folks routinely get by with ponds
of 2 1/2 to 3 feet deep up in Rhode Island and Pennnsylvania during
winter months, and not all of them use a heater, but do maintain an
opening in the ice. A simple air pump will work in most cases to keep
a hole in the ice........but an external temporary shelter made out of
PVC pipe framework covered in plastic sheeting does a lot of good as
well. It doe snot matter if your pond is 4 feet deep and it only
freezes to 3 feet the fish will still be ok..............with or
without a heater. Running a heater is not cheap.......

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Put some color in your cheeks...garden naked!

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I assume we are talking 2.5 to 3 feet below ground.