Disclosed is a boiler apparatus useful for the heating of living and working spaces. During a rewind operation, a reference picture for a group of pictures is decoded and stored into a reference frame buffer. In the second group, a common ejection amount ejection outlet array ejects the same amount of liquid as that of one of the first and second ejection outlet arrays and a non-common ejection amount ejection outlet array ejects an amount of the liquid that differs from that of the first ejection outlet array group. The optical time delay is used for at least partially compensating for a velocity mismatch between the light and the RF drive signal.