Sundancefisher,
Take that cover back and get it adjusted with another layer of soft foam closed cell insulation for the corners. Take lots of pictures and measurements of the gap for reference.
What the Cover is for is more than just keeping the heat in, it is your best insurance from a freeze up and a ruined tub.
You live in Calgary, but even a few days of -20 C when the tub heater has failed, will be enough to freeze the biggest tub if there is a gap at the corners. Unless you are checking this tub ever couple of days, or have a freeze alarm floating in it, that works, the cover must seal properly.
Worst case scenario the breaker trips, it is not noticed, and even a tub that recirculates to stop freeze up at low temperatures will freeze up.
That being said, if it is - 40 C, and the tub was warm when the heat goes out, or the power goes out, you really only have a few days before serious damage is done.
The fix is pretty easy in hindsight, and the shop will probably be very interested in the make and model for future reference.
My tub is at the Cabin, and as such, I drain it every fall and run 10 litres of plumbing antifreeze. It just is not worth the grief in the winter.
Drewski
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