@Lisak1 ... what wattage is your heater and where is it placed? Is everything shutdown and drained for the winter? Just curious as with the way I have things setup, I've never had ice. Zone 7b ....
No clue. We don't even use the de-icer on a regular basis. We run our pond all winter long - the de-icer is on stand by in case anything fails mid-winter.
Current temp in my back yard : -5F. Yes, that's a minus 5.