The town where a friend of mine built a house 15+ years ago required sprinklers. The pipes ran through an unheated basement. I asked about freezing and he said that because the pipes ran through the basement it wasn't just water in the pipes, it's water plus antifreeze. Obviously if there's a fire and the antifreeze all gets sprayed they'd have to refresh the system with new antifreeze.
It's a pretty small cost to add sprinklers to new construction. Fires are rare but they're expensive as hell. And you can rebuild a house; you can't rebuild a burned-to-death person.
I've lived through one fire, in an apartment building. Two blocks from the firehouse and we got everyone out okay (my neighbor and I ran around banging on doors until it got too scary to stay). I'd have loved to have sprinklers (the building was from 1921 and didn't even have closed-off staircases).
I asked an office building fire safety director once what maintenance was required for the paraffin sprinkler heads and he said he couldn't recall a case of a malfunction. It's a pretty simple device and there are millions upon millions of them installed. I've never gotten wet working inside an office or walking into a store.
As far as the Constitution, it does state that anything not specifically addressed in it is relegated to the states, so there's nothing unconstitutional about Pennsylvania passing such a law, unless of course the state Constitution prohibits it. Rather doubtful.
Copyright 2011 by Shaun Eli. All rights reserved.