Free Shipping on orders over $599! Excluding HI & AK, and products requiring special shipping arrangements.

General Information

Wi-Fi Zoning Thermostat

The THM-0300 is a 3 stage fully programmable P.I.D thermostat designed for hydronic radiant heating. The large, full graphic display is easy to read and simple to navigate using a push button keypad control. The thermostat can handle multiple heating and cooling modes within each zone and also includes a geothermal mode that can run 2- stage heating and 2-stage cooling for a 4-pipe geothermal system.
Average: 5 (2 votes)
Out of Stock
Related products Product info Specs Videos Reviews Q&A

Product Info

Designed for quick and simple installation, the THM-0300 utilizes only 2 wires (power and communication) to the ZON-0550, making it ideal for retrofits as well as the new installs.

The Wi-Fi Zoning system also offers features that fit your life style such as 5 and 2 day programming capabilities with 4 setbacks per day and away mode. With Away mode, you can set a customized temperature for each zone when you're not home or on vacation to maximize energy savings and reduce your utility bills. Turn off away mode before you get back and return to a comfortable home.

A single on board auxiliary sensor will allow for internal room, external floor, or outdoor sensing options.

NOTE: The THM-0300 is designed to work with the ZON-0550 Zone Control. It is not a standalone unit.

Features & Benefits

  • 2 wire thermostat (power and communication)
  • 5/2 day programmable schedule
  • Radiant Floor heating or cooling
  • Internal room, external floor or outdoor sensing capabilities
  • Intermittent fan control
  • Zone priority setup
  • Zone demand setup options (high temp, low temp, DHW, fancoil)
  • Customize zone name feature with HBX Zone App
  • Away mode (customized temperatures when you're not home to save on energy bills)
  • Up to 3 stage heating and cooling
  • Outdoor or floor temperature display
  • Geo Mode ( 2 or 4 pipe systems)
  • Automatic heat/cool changeover
  • Run temperatures in °C or °F
  • Large, full graphic display
  • Easy programming menus
  • Limited 2 year warranty


  • Large, full graphic display
  • Customize zone name feature with HBX Zone App
  • 2 wire thermostat (power and communication)
Circuit Breaker Size
Connection Type
Height (inches)
Weight (lbs/empty)
Width (inched)
Wire Size

Product Q&A

No questions about this product yet
Ask The Question
We deliver energy savings, competitive pricing, unlimited hot water, more than 42 years of experience and free lifetime technical support
Contact us
8AM-4:30PM MST Monday-Friday
5350 Joliet Street, Unit 1, Denver, CO 80239