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Xringer · 05-16-11, 03:52 PM

I'm not sure. It might be borderline for larger than 1/2 copper lines.
I've used MAPP gas before, when installing hotwater solar using 95/5 solder (95 % TIN) on 3/4" copper pipes and fittings.

But, after watching some videos of HVAC braze jobs, I can see the pipe and fittings glowing cherry red..
The filler metal used on a lot of those jobs, was 15% silver and 85% copper. (Very costly stuff).

If I decide to DIY a heat exchanger, then it's doubtful MAPP alone would be the way to go..

05-16-11, 03:52 PM	#3
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I'm not sure. It might be borderline for larger than 1/2 copper lines. I've used MAPP gas before, when installing hotwater solar using 95/5 solder (95 % TIN) on 3/4" copper pipes and fittings. But, after watching some videos of HVAC braze jobs, I can see the pipe and fittings glowing cherry red.. The filler metal used on a lot of those jobs, was 15% silver and 85% copper. (Very costly stuff). If I decide to DIY a heat exchanger, then it's doubtful MAPP alone would be the way to go..