Couple of options.
1) A large enough volume with sufficient motion may not freeze. You would have to do the calculations to double check.
2) Build an insulated "mini-shed" around the storage containers and combine it with the pump and you will need a lot less energy. Again, need to do some calculations to make sure.
3) The "mini-shed" plus a heater on a timer, just enough to keep from freezing.
All of this and you are still going to have to do a lot to heat the water up for any significant water change or top off.
Charles
__________________
Where did my rum go?!
Success in this hobby does not count how you spend your money, it counts how you spend your time.
|