22 3500 - Indirect-Fired Water Heaters

See also: 22 3310 - Domestic Water Heaters

ACV International ( Triangle Tube )
Aerco International - High-efficiency boilers and water heaters for commercial applications.
Ajax Boiler
Aldrich Company
Amtrol
Aqua-Therm
Bock Water Heaters
Bryan Steam
Buderus
Burnham Corporation
Cemline Corporation
Dunkirk
Energy Kinetics
Flexcon Industries
Gasmaster Industries Incorporated
Green Boiler Technologies
Group Thermo
Heat Transfer Products
Laars Heating Systems
Lochinvar Corp.
Niles Steel Tank - Steel tank and ASME code pressure vessel fabricator.
Parker Boiler Co.
Patterson-Kelley Co.
Peerless Boiler
QuikWater
RECO USA
Therma-Stor
Utica Boilers
Viessmann Manufacturing Company
Weil-McLain
Williamson-Thermoflo Company

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