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I think I found it. I started opening up radiator covers. I found one (on the top floor) where the pressure valve is leaking water. Looks like it's been doing that for years, it's all rusty. ...

What is the correct pressure (psi)? I have a split level, the furnace is in the basement, the top floor begins at 12 feet above that. When I add water the psi goes up to 20. It then drops within...

The central heating system in my 50 year old home seems to be losing water pressure. We thought it might be due to some pipes that were running in a concrete slab and had leaked. We bypassed that,...