| heating system ?
If you have three kilowatts of electric ready to go why can you not switch it on now?
I also dont know why you have switched your filter off .
If i was in your shoes i would put it all on now and to save money on your electricity cover your pond over either all the time or at night (i cover mine at night).
Your fish will be happier in warmer water and will thrive instead of survive!
As for how long to heat up i do not know it depends if you cover it up and what the air temperature is.
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