Yes, that would work also, they can make a pretty intense flame, acting much the same as a blowtorch burner used on the plumber's pots.Not very useful . I would recommend propane and a 30 PSI regulator. And something like this:
View attachment 368696
However! If the water heater has a metal tank, that could make a perfect furnace body.
Robert
As I attempted to remove the gas regulator from said hot water heater, I cracked the casting & it did not budge at all. While I believe it to be whole enough to be of use for something, it (based on all your input) could never help in generating the 2900 I hope to achieve. This is a great response to aid in the future of us wishing to pursue casting! If you have more, please share as it is not just for me!