• AMTROL, Inc.

• Aero Environmental Limited

• Albany Pump Company

• Alyan Pump Co.

• Aqua-Flo

• BEP Bestobell Inc.

• Bailey Controls Co.

• Barnes Canada

• Boilersmith Ltd.

• Bruner Water Treatment Systems

• Bryan Boilers

• Charles Ramm Associates

• Claude Laval Corporation

• Cleaver-Brooks Division of Aqua-Chem, Inc.

• Columbia Boiler Co. of Pottstown

• Cyclotherm of Watertown

• Ecodyne Ltd.

• Hays Cleveland

• Hydrolevel Co.

• ITT Fluid Handling

• Johnston Boiler Company

• Joseph Davis

• Kemco Systems

• Lattner Boiler Manufacturing

• Lattner Boiler Mfg. Co.

• Leedy Electric Corporation

• Leisure Baths Ltd.

• Leslie Controls

• Lockwood Products

• MEPCO

• Magnor Inc.

• Naylor Pipe Co.

• PVI Industries

• Peerless Painting Co. Inc.

• Pneuline Controls

• Precise Power Corp.

• Precision Boilers

• San Pedro Mesquite Company

• Skidmore

• Smith & Loveless

• Smith-Koch

• Sparco

• Spirax Sarco Canada Ltd.

• Superior Boiler Works

• Superior Boiler Works & Welding Ltd.

• The Johnson Corporation

• U.S. Filter

• Watts Regulator Company

• Williams & Davis Boilers

• Williams Furnace Company