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>> Why are you draining a new system ? Moving an upstairs radiator >> Are the new rads on drops ( pipes from ceiling) No, just regular ground level ratiators with pipes coming up from the floor. Thanks for your response.

I've always been able to drain my central heating system effectively. However, I had a plumber recently fit a new combi boiler and add a couple of radiator. Now only one of the flow/return sides of the system fully drain. The other one keeps most of it's water. I was thinking perhaps there...