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How do I add water to a hot water heating system? |
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. Well, from the sounds of things, your auto-fill valve may not be working. The fill valve should be the one that comes from the domestic water supply through the pressure regulator to the boiler(the other device sounds like a flow restrictor valve that limits how much hot water flows out of the tankless coil or a tempering valve that regulates the domestic water temperature). The unit with the built-in regulator should have a small brass lever on the top that when you lift up on it, bypasses the regulator(usually set to 12psi) and directs line pressure into the heating system. Anywhere between 15-25(most boiler pressure relief valves are set to pop off at 30psi) should be about where you need to be. If increasing the system pressure works(by the way, some circulator pumps work better at 20psi or so) gets all your radiation heating, then I would replace the fill valve, and that should do the trick. If that doesn't work, there may be more involved, at which point you should probably call a heating tech. Good luck, Steve Source(s): 20+ years in plumbing & heating sales Do you have radiators or baseboard and why are bleeding them? What is the pressure in boiler? And if you have water in the expansion tank you have other issues. And remember most plumbers do not go to school for heating. |
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