If you're using plastic, and you have the option, go with polypropylene ( has a 5 in the recycle triangle, and PP under it).
There is lots of labware that is PP-- like plastic sep funnels, beakers, stuff like that .
I don't know about the heating element being compatible with acids and solvents and shit, nor about the product after being in a solvent or acids and shit...
If I was using plastic, I would use a bigger bucket/tote/whatever, and use a sous vide, and heat the water inside to 10 degrees above the reaction temperature, and it will keep it there