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Discuss Rads not heating in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Hello guys, I looked at heating system yesterday. A large 2 story house with 2 story extension at back. The rads to extension never worked. Its a 90,000 btu oil fired boiler. Pipes from boiler are 22mm (should be 28mm) coming from shad near house. From what I can see I think flow and return for extension were teed into the existing flow and return undreground between boiler and house. I might put in a stronger circulating pump. If that doesent work, would pressuring the system make a difference to give system equal pressure.
 
What’s the existing pump and how many rads ?
 
I would try swapping the pump first
 
The resistance of the circuit eg boiler, pipe work and radiators
 

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