I have gone through this fairly recently, so let me share what I have
found. In effect, you need do nothing to “convert” to either propane
or natural gas. Just hook it up. You won’t be able to use the
smallest (#1) tip with propane, but that usually is no problem. I
could not get a straight answer from Smith, the makers of the Little
Torch, about the use of natural gas at low pressures until after I
had already installed my propane setup. Since, they have said that
the torch will work fine at 3 or 4 ounces of pressure typical in
residential gas installations. Just reduce the pressure of the
oxygen. I have not tried it, however. Because of insurance reasons,
I located my 20# propane canister outside, in an approved location,
and ran pipe to my bench location. I had a plumber do this, with a
building permit to satisfy the insurance company. I have a friend, a
full-time jeweler, who keeps his 20# cylinder under his bench. He
has had no problems doing this, but I like mine outside!
Your acetylene regulator should work just fine, but will require some
conversion or adapters to allow it to attach to the propane canister.
I found that it was cheaper to buy an inexpensive single-stage
regulator with a pressure guage and variable pressure setting. Many
recommendations are for a more expensive 2-stage regulator, however.
Either way-converting the old regulator or buying a new, inexpensive
regulator-would have cost me about $20, so I bought the new
Now I am glad I decided to use propane, because I am installing a
second torch which will not use “house gas” at such low pressure.
At some point in the future, I might try the natural gas option, just
to see how well it works.