Tumbleweed wrote or quoted:
"Bob Hobden" wrote in message
"Harry Ziman" wrote ...

My question is about the winter - is it necessary to remove the pumps to
avoid them from being frozen or do they survive freezing?

Yes it is essential to ensure they don't freeze, water expands on freezing
so they would suffer damage.

If the pump is entirely under the water, no, the pressure on all sides would
be equal assuming it did freeze that hard.

....and assuming that it freezes and defrosts on all sides simultaneously ;-)
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