I keep a few gasoline powered camp stoves that are only used to melt lead. The gasoline units are cheap and easily found. Of the American made products, the Coleman stoves are as common as crabgrass and amazingly simple.
The other day I wanted to convert a large pig of Linotype into 1 pound ingots and pulled out an old Coleman stove to provide the heat needed. That Coleman, an old 425E that I purchased from a charity store for next to nothing, was up to the task.
As typical of any neglected camp stove, it needed a little fiddling to get it running but that's half the fun. The leather used in the pump was dry and it wouldn't seal. A little bit of Ballistol and about 2 minutes of disassembly / reassembly and I was in business!
Coleman stoves are certainly not the highest grade camp stoves to be found, but for the money they sure do perform.