Hmm. Does that work? Doesn't hot water freeze faster than cold?
Thanks for the ideas for enclosing the tanks. I'm going to use leftover pieces of polyiso from our house remodel and I was planning to buy a piece of 4 x8 sheet plastic to cover that. I could do a layer of reflectix too. Was going to hang the insulated boxes from the steel holders for the tanks. But might not get to it until next year. Don't have the handlebar heaters yet. May not make it until January! That is a lot longer than from an ebay seller.