A healthy boiler is fairly quiet. New or louder noises are worth paying attention to, they’re often an early warning that something needs attention before it becomes a breakdown.
Banging or “kettling” usually means limescale or sludge build-up on the heat exchanger. A power flush often solves it. Whistling can be trapped air or low pressure. Gurgling often points to trapped air or a frozen condensate pipe in winter.
Tapping or clicking on start-up can be normal expansion, but persistent clicking with no ignition may be a faulty gas valve or ignition lead.
Because boilers run on gas, anything you’re unsure about is best left to a Gas Safe engineer. We can usually diagnose the noise on the first visit and quote on the spot.
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