People have used camping burners in their boats without blowing themselves up. The thing to remember is that the camping stoves aren't stainless, so they may rust out in 5-10 years, no big deal. And the gas "bottles" usually are only sealed by a rubber ball that sits in the stem to plug
it when not in use. These LEAK, so you'd want to buy a brass screw-cap that securely covers the stem and prevents any leak (two for $5 in camping stores?) when it isn't in use. And of course, be mindful that casual use of explosive fuel
gasses on a boat may be more exciting than you had planned.
I've also used the $20 "Korean BBQ" burner that takes a smaller butane can. No equivalent brass safety
cap for those, but the whole thing is $20, one burner, the size of a looseleaf notebook so it can be stowed in something gas-tight above deck
. And for $21 you can find the good ones, that come in a plastic storage
box as well.(G)
Just make sure that anyone who is ever going to come in contact with a portable burner KNOWS that gas can explode, and is supposed to do that if mishandled.