Boiler Pressure Valve...releiving

ChadZeilenga

We have a hydronic boiler system in our 100 yr old house.  The boiler looks to be ~10-20 yrs old and is functioning well except for the pressure relief valve. 



Last winter I noticed that the valve would be leaking at times, so I replaced it with one from a local heating company that matched the psi and was a replacement.



This winter I've noticed the same amount of water on the floor of the basement, but also noticed that during normal operation the boiler is ~20psi, and when it's hot is almost 30psi and this is when it relieves.  When I knock on the expansion tank it sounds like it's pretty empty.



I figured I'd leave the valve until the summer, but tonight it let out a lot more water than before, so I quickly shut off the boiler and closed the supply valve. 

Mark Eatherton

Go here....

http://contractormag.com/hydronics/cm_column_75/You need to service your expansion tank and if there are any automatic air vents, either eliminate them or close them off.



Knocking on the tank doesn't really tell you anything.



ME