![]() Furthermore the point where the pumped radiator circuit returned to the gravity feed loop was well away from the boiler and actually fairly near the header tank. Inspection soon revealed that it did indeed appear to have been installed without an injector (or venturi) Tee joint. As the previous owner had told us that the Rayburn had been installed by their previous occupant, who had installed it himself, we suspected it had not been plumbed properly. Downstairs radiators remained cold.Īfter a bit of research we found out that a gravity feed boiler such as a Rayburn needs special plumbing when used with a pumped radiator system. ![]() As soon as we did, the header tank overflowed and the upstairs radiators filled with air. When we bought our holiday cottage we quickly found out that the central heating did not work: it was fine heating the upstairs as long as we did not turn on the pump. ![]()
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