Each year it seems I have to replace the pressure valve, circulator pump or black pipe near my boiler. Each time, the rust has plugged something up. This year, I call my service guy in to fix what I tought was a problem with the pressure valve. Turns out, everything from the boiler to the copper that heads it to the radiators had to be replaced. Every inlet and outlet for all the black pipe, t's, elbows, valves, tank and the circulator pump was clogged with rust. A couple of the black pipe ends were rotted completly. Lucky they didn't bust open. Service guy suggests a whole whole water filter to remove the minerals that may be causing this rust build up.

This is a closed system I thought so I'm not sure how that'll help. But I can't explain how this rust builds up like this.

Any advise is appreciated!