Hi Guys - I had a Williamson GSA 150K boiler that cracked and had it replaced by a Utica peg150eid. I started getting Water Hammer noises a few days and water gushing out of a Steam heater element fin that's in the ceiling of the basement bedroom. Also water hammer noises in a few other pipes. I tried replacing the steam valves for the system based on the recommendation from the technician that installed the new boiler. After consulting, a few other boiler guys, i was told its either caused by incorrect piping for the new boiler or the length of the pipe where the Hartford Loop makes the 90 degree turn. The piping looks wrong based on the Piping Diagram for the model. Attached are some pics of the system. As you can see there are 2 steam headers/mains, and 2 wet returns. The wet returns join in the back of the boiler and head for the hartford loop, Any advice is greatly appreciated.