Originally Posted by Bobby_M
I think burning the flux is a common problem no matter what heat source you use. I like to heat far away from the joint for a few seconds, then get the heat concentrated to the work area right before applying the solder. I do have a MAPP tank now but it's not THAT much different.
Agree to disagree. Time and failure rate are of utmost importance and I have never had flux dry out on a MAPP gas joint (assuming you are doing it right!). Not to mention I soldered the 8 joints on my MT drain manifold (18 actual connections) in roughly 90 seconds.
There is a reason you will never see a professional plumber use propane vs MAPP. When you have to warranty your work and hours matter on fixed-rate jobsites, it makes a big difference.
Like I said, a single 90 degree elbow like that requires about 10 seconds of heat application and both ends of the elbow are ready for final sweating. Propane takes longer.
Also nevermind that with propane running for so much longer per joint, that in real on-site plumbing applications, you create a much higher risk of starting a fire.
EDIT: And if you are starting from scratch as a noob and have to buy the equipment, a MAPP gas kit ain't that much extra on top of a Propane one, IMO. And a good experience will give you the confidence to tackle other jobs you might never have considered. I honestly think the plumbers union subsidizes the propane kits to scare people into hiring a plumber after the first couple joints they make fail.