- Aire-Flo
- Amana
- American Standard
- Arcoaire
- Armstrong
- Bryan
- Carrier
- Centrion
- Clare
- Coleman
- Comformaker
- Dayton
- Ducane
- Emerson
- Evcon
- Fedders
- Friedrich
- Frigodaire
- Fujitsu
- Goodman
- Heil
- Homart
- Intertherm
- Janitrol
- Kenmore
- Laars
- Lennox
- Luxaire
- Magic Park
- Maytag
- Mitsubishi
- Modine
- Nu-Tone
- Payne
- Reznor
- Rheem
- Ruud
- Samsung
- Sanyo
- Sears
- Sharp
- Spacepak
- Tappan
- Tempstar
- Thermo Pride
- Trane
- Weatherking
- Westhouse
- Whirlpool
- Williamson-Thermaflo
- York
Boilers
- Burnham
- Crown
- Dunkrik
- Munchkin
- Peerless
- Slant/Fin
- Utica
- Watts
- Weil-Mclain
Gas Fireplaces
- American Fyre Designs
- Bio Flame
- Buck Stove
- Duluth Forge
- Empire
- Fire Sense
- FireRock
- Firegear
- Heatmaster
- Kingsman
- Majestic
- Mason Life
- Monessen
- Napolean
- Pro Com
- Sierra Flame
- Superior
Heat Pumps
- Amana
- American Standard
- Bryant
- Carrier
- Coleman
- Goodman
- Lennox
- Rheem
- Ruud
- Trane
- York
Tube Heaters
- Calcana
- Caribe
- Combustion Research
- Dayton
- Easy Radiant
- Heastar
- Infrasave
- Mr. Heater
- Re-Verber-Ray
- Schwank
- Solaronics
- Space-Ray
- Sunstar
- Superior Radient