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I did have a little 12volt automative fan demister but they do use a lot of juice. I also knew of someone who fitted a car heater from an early Landrover / Morris Minor (simple matrix and fan)which he hooked into the sealed cooling system. Only worked whilst under way but with a duct directed at the screen worked quite well. Tended to blow out spiders when first started if that worries you
"Daddy? Is that mast thing supposed to have a jagged top?" Bill...
thanks for that, I had thought of using a ex car heater but the duct work would be tricky, although I may try one later for heating the cockpit to extend the season, we already have a diesel heater for the cabin.
I think I will try an electric heater, hopefully it wont need to be on for long and then only when the engine is running, it will probably draw 15A I guess