Propane or CNG.
Dear friend, I'd have to agree with Loren, I'm as sure as I can be that the Force 10 stove is propane fueled. We have the two burner with oven model in addition to a Force 10 propane heater, both along the port is of our boat. If you have, or plan to have something similar, learn from my mistake and be sure to lead two separate propane lines from your tank or locker, one line per appliance. At first I led one line to the heater forward and inserted a T fitting in it as it passed the stove. That's an ABYC no-no and might also be a USCG infraction. Find a propane service shop near you and have the hoses custom made to length with the correct fittings added by them. The short line inside my propane locker separates into two and they lead to a pair of airtight through bulkhead fittings in the side of the propane locker. From there the two lines lead forward to their respective appliances. Go for it, they're nice stoves, Glyn Judson, E31 hull #55, Marina del Rey CA