This year will be my first close. I am waiting on a winter cover that will like arrive in early November. I live in Canada, and it is likely going to be around-5 Celsius when I close. I have a gas heater so I can keep that on intermittently to prevent it from freezing, but I'm concerned that once I do the partial drain before getting the lines blown out there will be a period of time with no heat or water running through the lines. Is this too risky? Should I close and put a tarp over the pool while I wait for the winter cover? Thanks for any advice.