It's an old (early 90's) steel bike, I don't think there are any AL parts on it.
I don't (yet) have high-pressure tires on the bike, just 40 psi knobbies. I'm planning on moving to high-pressure tires come spring, but by then we probably won't be using the boiler.
I'll put a thermometer in the boiler room to see how hot it gets; offhand, I'd say it gets into the 90s easy. It was -2F on New Years Eve, and we tend to get a cold spurt (-20F or so) in February.