Yeah, let's operate on a flimsy tank of highly flammable liquid hydrocarbon. Great idea! What could possibly go wrong?
A tank of gasoline is infinitely safer than having every teenage girl and housewife running live steam. And then of course, it’s really fun to have to wait for the water to boil, and also to have to find water.
Oh, and by the way sport, you’ll need that tank of flammable fuel to heat the water up to operating temperatures. Unless you are planning to burn coal or wood.