I'm on a 27 foot cape dory, a classic sailboat. it's jussssssst barely enough space for myself. I have a Dickinson marine diesel fireplace affixed to a bulkhead

I'm on a 27 foot cape dory, a classic sailboat. it's jussssssst barely enough space for myself. I have a Dickinson marine diesel fireplace affixed to a bulkhead for when it gets cold, it'll run for a whole day on one gallon of fuel but makes the boat way too hot if left on constantly.