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Looks like someone "repurposed" steam radiators by adding return lines. You've got a buttload of uninsulated pipe there. I would seriously consider re-plumbing between the 3 radiators without dropping down and up again in between. This may be impossible or at least aesthetically ugly depending on where the radiators are & whether you can run ...

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If the radiators are in series, bypass valves in the basement to adjust the energy flow by "short-cutting" would be a solution. Sometimes the size of the radiators are adapted to the hot water flow in old systems. Also a flush of all radiators can help to improve the throughput - sometimes they are clogged with metal oxides and dirt like old car ...

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To get the minimum fill pressure of you system you can determine this in one of 2 ways: #1, measure from the top of the highest point in the system to the pressure gauge on the boiler and divide that distance in feet by 2.3. For example if that dimension is 30 feet (30 divided by 2.3 = 13.0 PSI. This is the minimum pressure in the boiler for a cold fill and ...

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