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Pump may cycle against the closed V/V they often get damaged this way, Go to a plumb center and pick one up persomally take old with you they are normally flat but a o ring may be a best temp fix. If you are up north and temprature drops aroung 5 degrees it will run on frost protection.

The tun is ok to move its external to the boiler, with good plumbing skills

Ok so I just got a Worcester Bosch 4000 boiler, It modulates, however their stat is junk and cant cope with metal walls, looses connection and is so slow I discarded, looked at tado, t6r honeywell, hive and nest none talk to boiler as wrong language of OT, the t6 r is tpi and boiler and rads set...

Just Chilling