A cytotoxic agent comprising one or more taxanes linked to a cell binding agent. The complex has a prolonged retention in the bloodstream after administration, making it useful in the treatment and prophylaxis of bone metabolic diseases. The fuel supply is a common mean fuel supply that is specified for all of the burners of the burner group by a temperature master controller. The programmable controller includes a mode control system adapted to receive a data signal to control the selective access to the at least one dormant operating mode.