According to CJT :
HeatMan wrote:

"Rich Greenberg" wrote in message

What are you using for heat? A bernz-a-matic torch with the standard
(blue) gas cylinders will just barely heat 1/2 inch copper enough for
soldering. Any larger pipe, you need mapp (yellow) gas cylinders.

I didn't know that. After all these years, I guess the 1 inch water lines I
use the propane to solder together are now bad.

VBG

I wondered about that, too, but thought maybe my experience was unusual.

Heh.

A MAPP (MPS) cylinder instead of propane indeed makes soldering pipe a
lot easier.

But, propane is still perfectly adequate for larger than 1/2" (at least
to 1") if you can visually establish that the solder is melting properly -
with proper technique, you don't get solder melting at all unless the
pipe gets hot enough to do the job right. Just takes longer.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.