I agree use it. Add blankets make sure plenty of gas, add windscreen scraper, thermal silver screens, warmer clothes. Remember that you are going to use more battery for lighting, heater fan etc.
In between trips drain down the water - especially the heater. I usually do this on the way home or up to storage by opening the boiler drain and taps so the water gets shaken out of the capillary tubes. Perhaps not perfect but not had any issues yet.
Paul