Work with WAHLCO, Inc.

WAHLCO is a leading provider of air pollution control equipment, servicing the utility, refinery and commercial industries worldwide, and a pioneer of the patented AOD® Ammonia on Demand system, the safest and most cost effective process for DeNOx for small industrial boilers.


WAHLCO offers an in-house
team of engineers, designers
and project managers.


WAHLCO’s headquarter
houses a 68,000-square-foot
manufacturing facility.


WAHLCO provides the highest quality products and dedicated services to our customers.


WAHLCO’s strategy is to
continue to invest in its people

and its future–for you.


Urea to Ammonia Systems (U2A®) for NOx Reduction

WAHLCO’s Urea to Ammonia generation system (U2A®) is a patented process that effectively converts urea to ammonia on site “on demand” and eliminates the transportation, transfer and storage of significant volumes of toxic ammonia.

The U2A® System basically reverses the process used to make urea. A urea solution is fed into a reactor, where it is heated under pressure to decompose to a gas mixture of ammonia, carbon dioxide and water vapor. This gas mixture is piped to the point use.


Wahlco AOD

AOD® Ammonia on Demand

AOD® is the Safest and Most Cost Effective Process for DeNOx

For small applications of up to approximately 30 pounds/hr of ammonia, WAHLCO has developed a cost effective urea to ammonia system under the trademark: AOD® (Ammonia on Demand).

The technology offers a small packaged unit complete with urea feed pump, controls, ammonia production, and heated dilution air. All of the components are installed on a small skid-base to enable quick and easy installation.



Aqueous Ammonia Systems

Aqueous Ammonia is a safer ammonia reagent for SCR applications than anhydrous ammonia; however it is more expensive on a delivered basis due to the large amount of water transported. Additionally in the case of 19% aqueous ammonia, there will be approximately five times as many deliveries as anhydrous ammonia. Operating costs are also higher due to the energy required to vaporize the water.


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Anhydrous Ammonia Systems

Anhydrous Ammonia is an economical reagent selection for utility SCR installations. The disadvantage of Anhydrous Ammonia is that it is classified as a hazardous material, and is subject to strict regulations and Risk Management Procedures for transport, storage, and handling. These requirements result in additional costs and complications in permitting and may generate local community concerns over transporting hazardous materials.



Flue Gas Conditioning

Flue Gas Conditioning is WAHLCO’s traditional core business and the product line which formed the basis of the company’s founding. FGC systems allow coal fired boilers to burn a wider variety of coals, including lower cost high ash coals and low sulfur coals which avoid the cost of scrubber installations, without affecting the performance of the fly ash particulate collectors (electrostatic precipitators).


Industrial Heaters

WAHLCO Duct Heaters are used to heat process air and gases up to 1200°F (650°C) for forced-air applications including drying, curing, heat treating, re-heating, dehumidification, and annealing. WAHLCO’s premium duct heaters are typically used in crucial high temperature applications requiring long life.

WAHLCO also manufactures custom designed Electric Tubular Immersion and Pipe Heaters available for heating any liquid, oil or gas including corrosive solutions in tanks, pipes or pressurized vessels.



Aftermarket Parts & Equipment Retofit Upgrades

WAHLCO actively maintains an inventory of replacement parts for standard and stock items as well as special order parts. Orders for stock items are processed and shipped quickly. Additionally, WAHLCO provides equipment retrofit upgrade services for existing air pollution control equipment installations. Order Standard & Stock Items and Special Order Parts:

Call (714) 979-7300 ext 3625 or




WAHLCO specializes in the manufacture of custom and miniaturized thermocouples and thermocouple assemblies. WAHLCO thermocouples are typically used in harsh, high-vibration, high-pressure, high-temperature applications that require reliable, accurate, and fast temperature sensing. WAHLCO thermocouples are widely used in gas turbine applications, as well as critical industrial applications, including the temperature measurement of air, water, oil, corrosive and non-corrosive liquids.


Contact WAHLCO to learn more about our Parts & Services