Major Plot Hole

Good point, I didnt even consider that.

I guess we have to assume that he turned it off before he killed himself. Even that would have resulted in a lot of damage to the hotel from pipes freezing all over the building, but I guess they could have still recovered from that. Ullman also mentioned them "being in the black" since 1975 though, so there couldnt have been any major repairs after that year.

It seemed like Jack was dumping the boiler almost every day, so I really doubt it could last long on its own.

Actually, I always thought the biggest plot hole in the book (and this miniseries), was the idea that the owners of a hotel, where guests come to stay, and which when full will house hundreds of people, would maintain in service an old boiler that is so dangerous it requires people to actively release the pressure that builds up, and if someone were ever to forget to do this in time, the boiler would explode catastrophically and burn the whole hotel down.

Replacing an automatic pressure relief valve on a steam boiler should not be that hard. Even if it's an old boiler and the parts are no longer made, odds are a good machinist could fabricate one. They're not complicated. Even the cost of replacing the whole boiler would pale in comparison to the incredible liability of continuing to operate such a dangerous machine in a building full of hundreds of guests that might get killed if the machine blows.

You'd think a magic house that could do all the shit it did could dump it's own damn boiler!