Make that a third. I have a Dickenson Adriatic
in my hunting cabin and use it for cooking as well as heat. I would not use it on a sailboat for a number of reasons I will list if asked. In fact I have a small two burner kero unit I intend to take up there next trip, for use when it is warmer.
On our boats we have two burner kero units with ovens, they can be a bit fiddley and there is a learning
curve, but I feel they are worth it. They cook really well, bake bread, etc. without excessively heating
the boat. They are safe and you loose the damn propane tanks
( but get a small Kero tank.). Each boat also has a Kero bullhead heater for auxiliary heat. Each boat also has an Espar D4 hot air heater.
We lived in our big boat much of last winter, down to 1°F. It was OK.