Wetted media system

The DriSteem Wetted media system provides evaporative cooling and humidification for a wide variety of applications while taking advantage of the free cooling and energy savings inherent with this technology. The system can be installed in air handlers and ducts.


Heat already in the air evaporates water as it passes through the saturated media, saving on energy costs compared to alternative evaporative cooling equipment or steam humidification.

Reduces cooling load

Every pound of water evaporated into the air removes about 1000 Btu of heat from the air (every kg evaporated removes approximately 2250 kJ of heat). This evaporative cooling effect reduces the building's cooling load, resulting in significant energy savings in applications requiring both cooling and humidification.

Low maintenance

The system manages the concentration of dissolved solids to minimize scaling and lengthen media life. Replacement media cassettes are easy to install.

Product Resources
Features and Benefits
  • Low energy usage with each stage having its own pump, and each pump running only when that stage requires water (up to three stages per system).
  • Maximum uptime is created when the controller initiates dry-out cycles only when needed and dries media only as long as necessary.
  • Built-in redundancy with multiple pumps minimizes the potential for downtime.
  • Continuous operation is provided by multi-stage systems, because when one or two stages are in dry-out mode the other stages remain active.
  • Maximum performance is achieved by the controller's monitoring of the system; a message is displayed when it's time to replace the media.
  • Optimum control is established by the system's ability to anticipate the need for additional stages based on temperatures upstream and downstream of the wetted media.
  • Reduced water waste and extended media life result from the system's ability to minimize scaling by tracking the volume of evaporated water.
  • Drain blockage is prevented by the system's ability to flush debris before it can settle.


Capacity: Varies with application. See our performance chart for system efficiencies and capacities.

Control: Vapor-logic® controller

Applications: Any application requiring cooling or humidification. Especially suited for applications requiring simultaneous cooling and humidification. Commonly used in data centers, industrial manufacturing, printing facilities,and applications using air-side economizers.

Options: BACnet® or LonTalk® communication protocols


New to the world of commercial humidification and evaporative cooling systems? Looking for an easy way to better understand the products and options available for your project? Our product selection guide can help you sort through the choices and point you in the right direction.

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Get in touch with your local sales representative for more information about DriSteem products and how to proceed with project planning.