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Can anyone help? Replaced hot water indirect cylinder which was leaking with the same size cylinder. Radiators are fine but can only get hot water if immersion is on. Spent some time looking for an airlock and checking for dirt in system but no luck. Didn't realise we had to specify that we...

Hi folks, I am fitting a new hot water cylinder due to finding a leak. There is a small copper cylinder directly above the hot water cylinder. Is this an expansion tank? It's an indirect cylinder from a multi stove with 7 radiators and dhw. There is a feeder tank and the cold water tank in the...