HVAC system on the roof of a warehouse

Web Thermostat

A thermostat that is entirely monitored and controlled with a smartphone or any web browser! The X-300™ Advanced Web-Enabled Temperature Monitoring & Thermostat is a modern, full-featured thermostat. Connect up to three temperature/humidity sensors to the X-300 in thermostat mode.

Directly wire the X-300 to your HVAC unit and use it’s web-based user interface to program, control, and monitor a single-stage thermostat. Monitor and control of the X-300 Web Thermostat without any cloud services! There are no service or reoccurring fees.


  • Full-featured thermostat
  • Scheduling
  • Built-in web server
  • Email/text notifications
  • 1-3 temp/humidity sensors
  • Wide temperature range for unique applications
  • And much more…

Web-Enabled Thermostat

In the example, an HVAC unit located in an office building is wired directly to the X-300. The X-300 monitors and controls the indoor temperature. It also monitors and displays the outdoor temperature. During the winter months, the X-300 is programmed to maintain a lower temperature in the office building after hours, and to maintain a higher temperature right before business hours and throughout the day.

Energy Efficiency

On the weekends and holidays when the office is unoccupied, the X-300 is programmed to maintain the office at a lower temperature, allowing the company to save money on heating costs.

No Cloud Services or Monthly Fees

The X-300 is ideal for managing both heating and air conditioning remotely. With the X-300’s built-in web server, you can access the thermostat controls on a mobile phone or by using a web browser. There are no monthly fees, and no software to install!

You can also use our free, CBW-Mobile app to access, control, and monitor ControlByWeb devices on one central control panel.

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