So, I'm shutting down my furnace for the season. Central Boiler CL-5648. I've let the fire burn down, and made the required plumbing valve changes on my oil heat system for "oil only" (hot water heating). I don't think it's going to get below freezing again, but I'm wondering if I should keep the pump on the furnace running to circulate heat to the boiler, just to be safe? This is my first season with this system, so forgive a n00b! Any suggestions appreciated.