finally figured out my boiler plumbing - anyone else find it tricky?

You're right to be cautious about ventilation - carbon monoxide isn't something to mess around with. I've seen setups where folks overlook proper venting clearances or don't check flue connections thoroughly, and it can lead to serious issues down the line. A good CO detector placed near your boiler area is always a smart move. Sounds like you're already being thorough, though...double-checking never hurts, especially when safety's involved. Better a few extra minutes spent now than dealing with headaches later.

"Better a few extra minutes spent now than dealing with headaches later."

Couldn't agree more. Another thing folks sometimes skip is checking combustion air supply - ever looked into that? Proper airflow is as crucial as venting; seen boilers struggle without it... just something else to keep an eye on.

Hmm, combustion air's important, sure... but honestly, isn't boiler pressure the real sneaky villain here? Mine kept dropping randomly - turned out it was a tiny leak. Ever had that happen? Talk about headaches later...

"Mine kept dropping randomly - turned out it was a tiny leak."

Been there, man... those sneaky leaks can drive you nuts. Took me forever to spot mine - ended up being a loose fitting tucked way behind the tank. Glad you got yours sorted, though.

Leaks like that are the absolute worst...I've chased pressure drops for days only to find it was a hairline crack in a solder joint. Honestly, if you're dealing with random pressure loss, my advice is always start simple - check fittings, valves, and even radiator bleed points before diving into anything complicated. Nine times outta ten, it's something tiny and easy to miss...boilers love playing hide-and-seek with leaks. Glad you figured yours out.