We stock every part for the Carel SD Series Electrode Steam humidifier ever made. Our technical support team can assist you should you have any questions about your Carel SD Steam humidifier. Remember to replace your Carel steam cylinder at least once per year for optimal operation. Most Carel Steam humidifiers will bring up a warning sign when the steam cylinder fails. Unfortunately you must view the unit periodically to know when it is time. We recommend you replace the steam tank at least once per year for residential applications and more often for commercial and industrial humidification needs.