Unfortunately correct. Download the instructions for the Excel metal roof flashing as an example.Many experienced professionals screw up bad on roof flashing installs. Been doing it wrong for 30 years. You really need to educate yourself about how it’s supposed to be done even if you hire it out.
Yes, in that case the price comparison would be fairer with the PE Super without the cast iron jacket.The kuma is a plate steel cat stove and the t5 a cast iron noncat. Either stove, properly sized, should be great. If you don’t care about cast iron looks then save the 1000$.