• Alexander Constructors, Inc.

• Ammark Corporation

• Boulder Associates, PC

• Burnham Corp.

• Bylin Engineered Systems

• CalorIQue Ltd.

• Combustion Research Corp.

• Cooper Carry, Inc.

• Delta-Therm Corp.

• Easy Heat Inc.

• Ecco Heating Products Ltd.

• Emerson Electric Co.

• Enerjee Ltd.

• Environmental Technologies

• F H P Mfg.

• Faber Associates International

• HTH Heatech Inc.

• Hacker Industries, Inc.

• Heat Transfer Systems, Inc.

• INDEECO

• Infloor Heating Systems

• Lennox Industries Ltd.

• MacDuffco Inc.

• PFG Industries

• Schwank USA

• Shelter Products Northwest

• Slant/Fin Corp.

• SmartGate

• Solar Depot

• SunQest

• Uponor Wirsbo

• Vanguard Piping Systems

• Vanguard Piping Systems, Inc.

• Warm Floor Center

• WaterFurnace International, Inc.

• Waterfurnace

• Watts Radiant

• Wedge Roofing, Inc.

• Weil-McLain

• Wirsbo Co.

• Woodbrier Associates, Inc.