We stock every part for the Vapac RH Steam humidifier ever made. LR models are resistance steam humidifiers which are dependable and easy-to-maintain, low-watt density heater elements, for reliable and accurate steam production. The all stainless steel construction of the cylinder ensures durability, easy cleaning and operation using de-ionized, de-mineralized, reverse osmosis, softened or potable water. The RH model was replaced by the LR model. Our technical support team can assist you should you have any questions about your Vapac RH Steam humidifier.