A boiler that repeatedly loses pressure needs investigation rather than constant topping up. Possible causes include a small leak somewhere on the heating system, a leaking radiator valve, a pressure-relief problem, an expansion-vessel issue or a fault inside the boiler.
Look for visible water around radiators, valves and accessible pipework, but do not remove the boiler casing. If you have to refill the system frequently, note how quickly the pressure falls and whether it drops only when the heating is cold or after it has been running.
In older Glasgow properties, long pipe runs and concealed heating pipework can make small leaks less obvious. The correct repair depends on identifying where the pressure is being lost. Doherty's boiler repair service can diagnose pressure faults and check whether the problem is in the appliance or the wider heating system.
