All I know is that they're reliable as hell, and a massive pain to replace.

Andy.......Don't do it and tell them to call a professional like Wheel said.

Of all things you don't need a carbon monoxide "family wipe out" because of something you did wrong.

Listen to Wheel.

Listen to Wheel.

that's a post I have never seen before and unlikely to see again!

LOL j/k Wheel

Called a pro..........things quickly went beyond the scope of my desired level of involvement in the whole thing.

good thinking