I had a Shipmate propane
stove on my old boat. It was the first thing I got rid of as it did not have thermocouples. Thermocouples shut off the fuel
supply if the flame blows out otherwise you flood your boat with propane
. Check your old Shipmate.
You will also have to build a proper propane locker (among other things) or carry the tanks outboard
. I am a fan of propane if installed properly and suggest that if you are not thoroughly familiar with the requirements you take a look at my Safe Boat Propane Systems