Vacuum cleaner with water filter constituted by an aspirator connected to an air inlet conduit controllable by an operator, and by a filtering chamber interposed between the conduit and the aspirator. The comfort noise is generated based on whether the background noise in the speech input is stationary or non-stationary. The circuitry spends a majority of time in a powered down state and draws power only when required to interrogate the state of the flame and to perform an ignition sequence as required, as periodically dictated by a watchdog system. The first and the second tubes are fastened together and capable of movement along the central longitudinal axis of the burner, but their ends closest the furnace are not capable of moving past the plane formed by the third, fourth, and fifth tubes.