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From the same household :) . Thanks for the post, but not sure I follow. If your isolate the flow and return pipes on boiler and the pressure doesn't drop, wouldn't that mean it's not the boiler?

From the same household :) . Thanks for the post. Is the theory that if you're isolating of the boiler and pressure is dropping, then it's a pressure issue in the boiler itself, whereas if it's dropping when they're open it's likely something on the pipes of rads?

From the same household :) . Thanks for the post. This is interesting. But would that link into the amount of drop in pressure? As an example, the pressure sat around 1.2 most of today. Boiler has heating up water and heating several times. It dropped a little this evening to 1.0 and then...