Heatran
Korea. Specializes in design of heat transfer equipment and related systems, including heat exchangers, heat recovery steam generators, waste heat boilers, economizers, condensers, heaters, and coolers.
http://www.heatran.com/

Heat Transfer Systems Inc.
Designs and manufactures broad range of thermal processing products. Includes heat exchangers, heat recovery boilers, and waste heat recovery units. Service include repairs, replacements, and modifications of existing equipment.
http://www.heattransfersys.com

Cain Industries
Cain Industries manufactures combustion exhaust heat transfer products. Our combustion retrofit and OEM markets include: diesel and gas cogeneration, boiler exhaust, and fume incineration. Products include economizers, waste heat boilers, finned tubes, HRSG and waste heat boilers.
http://www.cainind.com

Sidel Systems USA
Sidel Systems (USA)manufactures the SRU series of Condensing waste heat recovery units to the ASME codes. This equipment can reduce your natural gas bills by 10 to 15%.Sidel Systems also sells high efficiency LoNox boilers and burners and provides ASME constructed boiler waste heat recovery units, for boiler waste flue gas recovery.
http://www.sidelsystems.com

Unidyne Energy
Manufacturers of Waste Heat Recovery Systems, Steam and Hot Water Boilers, Thermic Fluid Heaters, Hot Air Generators.Based in India
http://unidyneenergy.tripod.com

NEM bv
The Netherlands. Specializes in design and manufacture of heat recovery steam generators, gas and oil fired boilers, and industrial and domestic waste incinerators. Site provides detailed product and application information.
http://www.nem.nl/

Superior Boiler Works
Waste heat boilers, Deaerators, Economizers, Feedwater tanks, Boiler Room Equipment, Custom Steel Fabrication
http://www.superiorboiler.com/

Indonesia - Grand Kartech
Manufactures steam boilers, hot water boilers, pressure vessel, autoclaves and heat exchangers.
http://www.e-steamboilers.com

Heat Technology Products
Heat Technology Products is a Manufacturers' Representative and Stocking Distributor engaged in sales of Boilers, Boiler Room Equipment, Heat Exchangers, Pre-Insulated Chimneys, Pre-Insulated Underground Pipe, Chillers, Cooling Towers, Process Analyzers, and All Related Instrumentation Controls.
http://www.heattech.com

Aalborg Industries
Aalborg Industries designs, manufactures and services marine steam and hot-water boiler plants including oil/gas-fired burners and control systems, thermal fluid heating systems, exhaust gas economizers, heat exchangers and inert gas systems. Aalborg Industries supplies its maritime deck and engine room equipment for all types of mercantile ships including Floating Production Systems. Industrial process boilers and waste heat recovery units are supplied. Aalborg Industries has a global After Sales organisation supplying service and spare parts.
http://www.aalborg-industries.com