After spending year in engineering school and having worked for numerous engineering company ranging from chemical to commercial construction, I can tell you right now that if you value your house, dont bake your tires in your stove. INCREDIBLY stupid.
Second, boiling weakens the bond but you can kiss that pot goodbye. If you want to boil, buy a crappy walmart pot for $5 and just throw it away afterwards.
The best way to get the tires and rims apart without causing any damage is to soak in acetone overnight. Acetone is what they use in hospitals to remove super glue from people. Wanna know how I know? Just soak your stuff in acetone over night. It works great.