If you do anything more than stay on board once in a blue moon or want to boil water for tea or coffee then throw the bugger overboard and get gas. Properly installed its as safe as anything else and you will not grow old waiting for the water to boil.
Both my last two boats came with 'alcohol' (we call it metho down here) stoves and they were jettisoned right quickly.
"Do you think God gets stoned? I think so... Look at the platypus." Robin Williams.