Hello, I just noticed a leak from my boiler today. It must have been leaking for at least a couple of days now. It's coming from the relief valve discharge line. I did some research and checked the expansion tank for excess water/inadequate air and I think it's fine(12psi like on the stamp). When I tested the relief valve the water was pretty dirty the first time. I've never discharged any water before today(had the system for almost 10 years now). The first time the valve took a long time to close, the rest it seemed to shut quicker. I've noticed the gauge next to the valve at 20 and sometimes closer to 25 psi. I'm assuming I need to replace the relief valve? If so, how do I know if I need the Conbraco 10-407 or 10-417(the tag only says 10-400 series)? Is there anything else I can check? Any input would be appreciated, thanks! [IMG]http://i738.photobucket.com/albums/xx28/HushFabrications/Boiler002.jpg[/IMG] [IMG]http://i738.photobucket.com/albums/xx28/HushFabrications/Boiler005.jpg[/IMG] [IMG]http://i738.photobucket.com/albums/xx28/HushFabrications/Boiler001.jpg[/IMG] [IMG]http://i738.photobucket.com/albums/xx28/HushFabrications/Boiler003.jpg[/IMG] I also noticed this on the other side... :( [IMG]http://i738.photobucket.com/albums/xx28/HushFabrications/Boiler004.jpg[/IMG]

about 6 or 7 years ago I converted an Amana HTM that had domestic hot water, a forced air system with air conditioning. I got tired of fixing it. I removed the guts, added a Weil Mclain boiler, Taco pump in place to the junk I had. I cobbled together controls added a relay to run the boiler and it has worked trouble free. I had replaced all the relays at the time with new ones. The problem is my documentation leaves a lot to be desired and it would be nice to have a standard system that would handle it all, with an instruction manual etc. I see you talking about Taco controls, however I do not see air handlers and air conditioning in what I looked at. If it is not off the shelf with clear hook up instructions I do not want it.