You have several choices. Propane, Mapp, Propylene and Acetylene.
You can buy burners for any one and air.
Propane is the UNhottest flame of them all. If you do much copper,
I'm surprised that you find propane hot enough for brazing. I would go
to your local welding supplier and pose your situation to them.
There are a lot of "Prestolite" outfits out there. These use a Tupe
B acetylene cylinder and air. You get the tank, the torch and several
feet of hose. Sounds like a good solution to me. Try running an ad in
your local newspaper for one. The Type B cylinder isn't regulated like
the bigger ones, so they can be refilled anywhere and you don't need
proof of original purchase. Not cheap, but a lot hotter.

Pete Stanaitis
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wrote:

I do alot of braze/solder work with copper and steel. Mostly
ornamental. I've always used a fairly cheap torch that attaches
directly to the small bottles of propane or mapp gas. I would like to
start using one of the 20 lbs. bottles of propane instead, so I don't
have to hold the bottle as well as the torch. Does anyone have any
recomendations for a good torch of this type? I don't want to use
oxygen also, just the propane. Thanks.