This thread has been bookmarked. Visit your bookmarked threads to review.
Post a Reply to this Thread
Oil Boiler Leaking Water (5 Posts)
Oil Boiler Leaking WaterMy oil boiler is leaking water.
I have water leaking from the pressure relief valve at a pretty steady
pace. It fills up a large mop bucket in about 2-3 days time.
The expansion tank on the oil boiler was mounted sideways rather than
vertically. It is unsupported and is sagging. However when the near side
of the tank (what would be top if mounted vertically) is hot while the
far side (what would be bottom if mounted vertically) is cool and it
does sound like there is air in the tank when performing the knock test.
This seems to indicate a working expansion tank. Does this mean that
the expansion tank is not likely the cause of the PRV leaking?
Another symptom is that the system always seems to have zero pressure
according to the boiler pressure guage. I believe the pressure guage is
working because if I hold the pressure valve open I can see the pressure
increasing on the guage.
Any ideas on what might be causing the leaking and zero pressure?
FixReplace the PRV.Sometimes when they discharge, they will not seal afterwards. Replace and properly mount the expansion tank. Is there a coil for domestic hot water in the boiler?
agree with Paulsounds like a water logged extrol, lazy feed valve
I agree but would go one further..I would replace what I like to call the "holy trinity"
Replace the water feeder, expansion tank & PRV.
The water feeder is not operating properly anymore if you have to manually open it to add water. The diaphragm in the expansion tank is most likely blown due to over pressurization The relief valve is probably not seating correctly anymore from it weeping so long or too many times.
In my experience, a situation like this is like a chain reaction, the water feeder goes bad, it ends up blowing the expansion tank, and then to relieve the built of pressure in the system, the PRV "weeps". And with correct pressure or not in the boiler, doesn't stop leaking.
And with correct pressure or not in the boiler, doesn't stop leaking.I bet it will stop leaking after a while, when the calcium deposits build up and seal it off.
Then, when the aquastat sitcks on, the excitement will start. Call in the mythbusters.