The pot........
The pot heats up and stores the heat and then slowly releases it back into the air in a more radial pattern than the flame alone . On your boat, it wouldnt do you much good. your boat is too large. You will need a heater. My Catalina had a propane stove, so i went out and got a Br. Buddy propane heater with a separate 11 lb bottle. That way if I had any gas left over, i could use the bottle for a spare in the warmer weather. I originally bought a heater and when i went to a propane dealer to buy a bottle, he told me to get rid of the heater i had and get a Mr. Buddy. he said that in adddition to a low oxygen shut-off it also was safer for some other reason i cant remember. Had something to do with propane burning thru a catalytic element. Anyway, Mr. Buddy kept my salon area in my Catalina 30 nice and comfy. Just about all of the portable camping type heaters dont radiate heat very far from the heater.