My hot water heating system boiler pressure is too low and I am pretty sure that the problem is not enough water in the system to maintain pressure (and hence heat) to the second floor of my house.
Yes, I have done the usual bleeding of radiators and even drained the expansion tank. [Do you think I should do these again?]
It seems that this system is set up to automatically fill but clearly the pressure is too low for a two story job and obviously there is some method to adding water.
There are what appears to be two ways to direct water to the boiler/system but both feed from the cold water supply to the house. One is by way of a shut off valve to a reducing valve to the boiler and the other is by way of a shut off valve to a [???? with numbers (1 1/2, 2, 2 1/2, etc.) on it] and then to the boiler. Both shut off valves are open so this is why I figure the system is auto-filled.
So there it is. I just can’t figure this out. Your help would be appreciated.
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