I just finished up the piping for the hot water system. Started off pretty messy(too much solder) but got the hang of it after a couple of joints.

I reckon I'm ready to have a go on my frame. I bought it for parts so if I wreck the frame, it's not a loss to me.

45% silver melts at around 700°C, whereas MAPP burns at about 2000°C. I'd imagine it'll be hot enough to melt 45% silver(or even higher percent). Or are you saying that the tubes can't be heated up to ~700°C with a MAPP torch?