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boiler switchin on when no water being used?

We live in a rented house with a combi boiler. This boiler keeps switching on when no hot water or heating is being used can you please tell me why this is
G Scholes, May 2009
which boiler are we talking about ?

keith, May 2009
Combi boilers keep a small amount of reserve water warm internally so there is instant hot water when you turn the tap on. The boiler periodically cuts in to keep this water hot.

Phil McCrackin, May 2009