Abstract: The present invention relates to an electronic controller for a boiler. The controller includes a control circuit that is adapted to provide a sequence of control signals to periodically turn the boiler ON and OFF during successive operational periods of the controller. Each operational period is started by an activation signal provided to the controller form an external device (e.g. a timer or thermostat and is ended by deactivation signal. At least one period of time for which the boiler is turned ON is longer than at least one other period of time for which the boiler is turned ON during a particular operational period.