We stock every part for the Trion MHST Series Steam humidifier ever made. Our technical support team can assist you should you have any questions about your Trion MHST Steam humidifier. Remember to replace your Trion Steam tank at least once per year for optimal operation. Most Trion Steam humidifiers will bring up a warning sign when the steam tank 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.