Once a year. Here is why.

Almost every manufacturer requires an annual service by a Gas Safe engineer. If you miss one, your guarantee may no longer be valid.
A service checks the boiler is burning cleanly and the flue is sound. That is the carbon monoxide check, which is the main reason to have one.
Replacing a worn part at a service costs less than a breakdown in winter.
Late summer or early autumn, before the heating season.
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