I'm on the same quest...
I was using a sturdy glass jar and when I put it into a heat bath, *crrrrrack*
Broke the thing clean in half.
I managed to get my remaining solvent but damn... It could have gone horribly pear shaped.
I'm told that heat resistant lab grade glass is the way to go, but I can't find large extraction sized for less than $600. So it looks like I've got to settle on multiple smaller extractions which suits me fine since I LOVE the process!