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In my 3400RL there is a 2" heat duct from the furnace into the underbelly to keep heat around the tanks. I am sure your 3650RK has it as well, just make sure you use the furnace and not just a space heater. The furnace needs to cycle on to blow heat into the underbelly, if you do a search on sreigle post on tanks freezing up, he goes into great detail as to why and how this is important.
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