Honeywell HVAC Resources

Expansion Tanks

Benoist Bros Supply Co

Wholesale Heating and Air Conditioning

Honeywell Expansion Tanks

Honeywell HVAC SmartHome Wi-Fi ThermostatAt Honeywell, we know what makes
a perfect comfortable and safe home. 

With technologies in more than 150 million homes worldwide, Honeywell provides the homeowners the tools to stay in control through the convenience of their mobile devices. Connected thermostats and home controls, fire and security systems, air and water purification are among our many products that provide homes around the world with greater comfort and safety. 

Buildings that use Honeywell’s solutions are smarter and more versatile. Our building-automation technologies can be found in more than 10 million buildings, where we drive value for owners and occupants.

Honeywell Expansion Tanks

Controls thermal water expansion in closed hydronic heating systems. Maintains system pressure below safety relief setting range. Welded construction with butyl rubber diaphragm. Potable water models include polypropylene lining to avoid rusting.


  • Thermostats Customer Support:
    • 855-733-5465
  • Indoor Air Quality
    & All Other Products Customer Support:
    • 800-468-1502
  • Lyric Customer Support: 
    • 800-633-3991

Lyric Support Customer Support Hours:
Monday – Sunday: 24 hours / 7 days a week

(excluding major US Holidays)

Honeywell Customer Support Hours:
Monday – Friday from 8:00AM – 7:00PM CST/CDT 
Saturday from 8:00AM - 6:00PM CST/CDT 
Sunday from 9:00AM – 6:00PM CST/CDT 

D6 Pro WiFi Ductless Controller


Honeywell D6 Pro Ductless Controller