by R-sole » Thu Feb 02, 2012 4:10 am
I think you only need to go up one pipe size, so if using 1" use 32mm for the sheath.
It's not a matter of your water getting hot at the end, it's a matter of contact with cool surface, so a stepped down liebig is going to be more efficient or a longer one.
If you really want to throw heat at it look on Artisan for some more complex builds, search punkindensor or triple walled liebig, even a graham condensor.