- Armstrong
- Bard
- Bosch
- Bryant Carrier
- Buderus
- Burnham by U.S. Boiler
- Carrier
- Coleman
- Crown
- Dunkirk Boilers
- Energy Kinetics
- Feeders
- Goodman
| - Heil
- Htp
- Hydrotherm
- Laars
- Lennox
- Lochinvar
- Mascot LX
- Navien Boilers
- New Yorker
- Olsen boilers
- Peerless
- Pensotti
- Raypak Inc.
| - Rheem
- Rinnai America Corporation
- Slant/Fin
- Smith Cast Iron Boilers
- Trane
- Triangle Tube
- Utica Boilers
- Viessmann
- Weil-McLain
- Williamson-Thermoflo
- York
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