Five years? That is a long time to sit on the fence about something that sits in your yard and just runs. I get being skeptical, I do, but five winters of paying whatever your old system charged you has to add up to a pretty penny. What finally pushed you over the edge, a bad bill or did the old unit quit on you? And now that it is in, does it actually heat the place when it is cold out, or are you still nervous about that part?

Beeswax on foam sounds like a mess waiting to happen once it gets warm, so that factory fresh look might just mean she never actually took it outside. Cheap tricks get shared like gospel but half of them fail the second you stress test them.

Using a heat gun on the shell for a couple minutes then hitting it with penetrating oil while it's still warm has worked for me on seized BBs, repeat a few cycles if it's really stuck. Also make sure you've got the right tool fully seated and maybe a breaker bar with a cheater pipe instead of trying to hold the frame down. Honestly on a carbon frame I'd rather take it to a shop than risk cracking the shell myself.