We stock every part for the Herrmidisteam SS Series Steam humidifier ever made. Our technical support team can assist you should you have any questions about your Herrmidifier SS Steam humidifier. Order from the source of Herrmidisteam SS humidifier parts just like the contractors do. This model uses building steam to make clean steam for humidification of the space. Building steam passes through a stainless steel heat exchanger. The heat exchanger is sitting in a tub of clean water which boils and produces clean steam.