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Old 05-16-11, 04:52 PM   #3
Xringer
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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..
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