I sail in a temperate but damp climate here in ireland. I often use 4 night light candles to warm up the cabin on cool damp nights. Placed just under a couple of foil preforated trays they keep the cabin warm and dry till sack time. I have also own a kerosene lamp/heater but feel the candles are safer for storage.
The great appear great because you are on your knees. James Larkin, Irish Labour Movement.