• A.O. Smith Corporation

• A.O. Smith Corporation

• AC&C Painting and Plastering, Inc.

• ACME Engineering Products

• AERCO

• AFGO Industrial Sales

• AMTROL, Inc.

• Aero Environmental Limited

• Alcore Fabricating Group

• Alltemp Products Company Ltd.

• Amtrol

• Arcon Canada Ltd.

• Armite Laboratories Inc.

• Armstrong Fluid Technology

• Auheng Industries Co. Ltd.

• Bingham Enterprises

• Boilersmith Ltd.

• Bryan Boilers

• Buderus Hydronic Systems

• Burnham Corp.

• Burnham Corporation

• CLAYTON INDUSTRIES, USA

• Caloritech Inc., Canada

• Caloritech Inc., USA

• Canadian General Filters Limited

• Carroll Manufacturing International

• Cemline Corp.

• Clean Burn

• Cleaver-Brooks

• Columbia Boiler Co. of Pottstown

• Controlled Energy Corp.

• Custom Hotel Painting

• Cyclotherm of Watertown

• Davis Energy Systems

• Design Fab Inc.

• Dewalt Industrial Power Tools Co.

• Dragon Concrete

• Dunham-Bush, Inc.

• Dunkirk

• Easco Boiler Corp.

• Ecco Heating Products Ltd.

• Electro-Steam Generation Corp.

• Emerson Electric Co.

• Energy Automation Systems, Inc.

• Field Controls Company

• Fil-Tec

• Fulton

• Fulton Boiler Works

• Garland Commercial Ranges Ltd.

• Gas-Fired Products

• Goodway Technologies Corporation

• Gordon-Piatt Energy Group

• Graham Mfg. Co.

• Growers Greenhouse Supplies Inc.

• Halco Products Co. Div.

• Heat Transfer Systems, Inc.

• Hubbell Electric Heater Co.

• Hurst Boiler & Welding Co., Inc.

• Hydrolevel Co.

• Hydrotherm Corp.

• INDEECO

• J.D. Gould Company, Inc.

• Johnson Controls, Inc.

• Johnston Boiler Company

• Joseph Davis

• Keltech Inc.

• Kemco Systems

• Kraissl Co.

• Kunkle Valves

• Lattner Boiler Manufacturing

• Lattner Boiler Mfg. Co.

• Leader Fan Industries Ltd.

• Leedy Electric Corporation

• Leslie Controls

• Lochinvar Corp.

• Ludell Mfg. Co.

• Machado and Silvetti Associates, Inc.

• Maxi-Therm

• McCoy Sauna & Steam

• Monitor Products, Inc.

• Noble Trade

• Northern Contours

• Ocean Steel

• PPC Industries

• PVI Industries

• Parker Boiler Co.

• Patterson Kelley Co.

• Payette Associates, Inc.

• Peerless Heater Co.

• Penn Separator Corp.

• Pick Heaters, Inc.

• Power Flame

• Powrmatic of Canada Ltd.

• Precision Boilers

• ProTech Systems

• R W Beckett of Canada Ltd.

• Ray Burner Company

• Raypak

• Raypak Canada Ltd.

• Reimers Electra Steam

• Rheem/Ruud Water Heater Div.

• Rite Engrg. & Mfg. Corp.

• Selkirk Metalbestos Ltd.

• Slant/Fin Corp.

• SmartGate

• Smith Cast Iron Boilers

• Smith-Koch

• Solar Depot

• Sparco

• Spartan Mfg.

• Spirotherm

• Superior Boiler Works

• Superior Boiler Works & Welding Ltd.

• Superior Manufacturing Division

• Teledyne Laars

• The Crosby Group, Inc.

• Therma-Flow/Everhot

• Thermal Conversion Corp.

• Thermo-Dynamics Boiler Company

• Trevor-Martin Corp

• Triad Boiler Systems

• URS Corporation

• Universal Boiler Works

• Universal Enterprises

• Urban Works, Inc.

• Utica Boilers

• Vapor Bus International

• Warren Electric Corpration

• Watts Radiant

• Weil-McLain

• Williams & Davis Boilers