Just visited an old home in Fairfield county. System has a very over sized 25 year old Smith 19-6 boiler . There are 3 zone valves on the supply piping to each area of home. They reduced the valves to 1-1/4". There is also a boiler return trap in the system. It is tied into the boiler header and the boiler return. The only markings are The letter S and number 2143H. I cannot identify this. The boiler is now leaking and they want to replace.
the connected load is 721 sq ft of steam. The owner says the system has worked flawlessly for 19 years . He says no noise or heating issues.
I was thinking that we need to 1) be sure the zone valves are dripped 2) add a small boiler feed pump 3) boiler return trap and piping. there are traps on the radiators. Any opinions on this? I cannot see how this system worked so well.