Even at low speed these pump move allot of water,
I would feel better with the pump running on high. but most variable speed motors only run on high for a few hours and return to low speed. If you cant force the motor to run on high continuously, IF YOU can't run it on high= The wind chill is the concern, might I suggest covering the plumbing portion with a tarp, just do not cover the motor it needs air to cool the motor.
A $10
hot water heater blanket Google Search might work on your filter,and some
plumbing insulation tape Google Search OR if it gets real cold you could build a temporary pump house out of say 2'' PVC and with 8 or more Concrete Blocks and some tie down straps to secure it down and cover the whole works with a tarp using some of the blocks to hold the tarp in place, this way the heat from the motor will keep it nice and warm inside your temporary pump shed,
but this is only if you can't run the motor on HIGH continuously, low speed worries me with possible - minus 40 Degree temps.
also turn the pools jets up to keep the pools water from freezing up and turning into a skating rink.
IF you have a pump that only runs on high for a few hours you will need to set your alarm clock and get up and reset the pump to run on high again, just to be safe.
The pump creates heat by act of pumping water, so you have that on your side.
..keep us informed on your results as these variable speed pumps are fairly new to the market.
thanks .. Jay
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