If a boiler is not getting used can the needle move a little and still does not mean there is a leak. If I turn heating on it goes back to where it was when first topped up but then if left off again for days goes back down ?
No it would be the water pressure reducing a little, as the it loose heat. If constantly drops till it reaches 0 then you have leak, other wise it just a pressure fluctuation.
As the pump and heating water increase the pressure.
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