On cold nights, what is more comfortable than a fire?
The diesel heater burns the air in the cabin and sends it up out the chimney. Then the box becomes very hot which warms the boat. As it burns, it sends the cabin air outside through the chimney and causes the dorades to draw air in. This fresh air is dry and clean, which leads to the boat becoming filled with warm and dry air.
It is amazing how fire can make a space change from habitable to comfortable.
