How Honeywell Evohome work?

The Honeywell Evohome is a sophisticated smart heating system designed to bring unparalleled control and efficiency to home heating. With a combination of a wireless relay box, battery-powered thermostats on radiators, a touchscreen panel, and the convenience of a mobile app, the Evohome system offers a comprehensive solution for zoning and managing temperatures in different areas of a home. In this exploration, we will delve into the key components and functionality of the Honeywell Evohome system, understanding how it operates to provide users with optimal comfort and energy efficiency.

Honeywelll Evohome componenets:

  1. Wireless Relay Box: Connects to your boiler and facilitates communication with the other components in the system.
  2. Battery-Powered Thermostats: Installed on individual radiators, these thermostats provide local control for specific zones.
    1. Touchscreen Panel:The main thermostat controller with atouchscreen interface, allowing for centralized control and monitoring. It syncs with the boiler relay switch over Wi-Fi.
  3. Zone Control: The system supports up to 12 zones, and each zone can include multiple radiators. This zoning capability allows for precise temperature control in different areas of the home.
  4. Overall Temperature Control: The main thermostat controller enables you to set an overall maximum temperature for the entire system, providing a degree of central control.
  5. Evohome App: The system can be controlled and monitored remotely using the Evohome app. This allows users to make adjustments, set schedules, and monitor the heating system from a mobile device.
  6. No Separate Hub: Unlike some other smart home systems, it seems that the Evohome system does not require a separate hub for app connectivity, simplifying the setup.

Here’s an overview of how it works:

    1. Central Controller:
      • The system is managed by a central controller, often a touchscreen panel or a mobile app.
      • The controller communicates wirelessly with individual components to coordinate heating activities.
    2. Smart Radiator Valves (HR92):
      • These valves replace traditional radiator valves and control the flow of hot water into specific radiators.
      • Each valve is equipped with a temperature sensor to monitor and regulate the room temperature.
    3. Underfloor Heating Controls:
      • For areas with underfloor heating, the system integrates with underfloor heating controls to adjust the temperature in those zones.
    4. Wireless Room Thermostats (ATC928G):
      • These thermostats measure the temperature in specific rooms and wirelessly communicate with the central controller.
      • They allow users to set desired temperatures for individual rooms or zones.
    5. Internet Gateway (RFG100):
      • The Internet Gateway connects the Evohome system to the internet, enabling remote control via a mobile app or web interface.
      • It facilitates firmware updates and allows users to monitor and adjust their heating system from anywhere.
    6. Boiler Relay (BDR91):
      • The boiler relay communicates with the central controller and the boiler to manage the heating system efficiently.
      • It controls the flow of hot water to the radiators based on the signals received from the central controller.
    7. OpenTherm Technology:
      • Evohome often utilizes OpenTherm technology for communication between the central controller and the boiler.
      • OpenTherm enables more precise control over the boiler, optimizing energy efficiency.
    8. Adaptive Learning:
      • The system may incorporate adaptive learning algorithms, adjusting heating schedules based on user preferences and the thermal characteristics of the home.
    9. Energy Monitoring:
      • Some versions of Evohome offer energy monitoring features, allowing users to track their heating usage and optimize for energy efficiency.
    10. Zoning Capabilities:
      • One of the key features is the ability to create multiple zones within a home, each with its own temperature control.You can have up to 12 zones in your house, each zone equipped with  multiple radiators.
      • This zoning capability allows for personalized comfort and energy savings in unused areas.

    Honeywell Evohome’s technical sophistication lies in its wireless communication, precise temperature control, and the ability to create a customized heating strategy for different parts of the home.

How to control Evohome?

Controlling the Honeywell Evohome system involves using the central controller, mobile app, or web interface. Here’s a step-by-step guide on how to control Evohome:

    1. Central Controller:
      • Use the touchscreen interface on the central controller (which could be a physical device installed in your home) to access and control the heating system.
      • Navigate through the menu options to set temperatures for individual zones, create schedules, and make adjustments.
    2. Mobile App:
      • Download and install the Honeywell Evohome app on your smartphone or tablet (available for iOS and Android).
      • Connect the app to your Evohome system using the provided credentials and pairing instructions.
      • Once connected, you can remotely control your heating system from anywhere with an internet connection.
      • Adjust temperatures for different zones, create schedules, and monitor your system’s status.
    3. Control via Home automation devicesHoneywell Evohome offers integration with popular smart home platforms like Alexa, Google Assistant, and IFTTT (If This Then That), allowing you to control your heating system through voice commands or automate it based on various triggers.
  1. Web Interface:
    • Access the Honeywell Evohome web interface through a compatible web browser.
    • Log in with your account credentials, which should be the same as those used for the mobile app.
    • Similar to the mobile app, the web interface allows you to control and monitor your heating system remotely.
  2. Zone Control:
    • Utilize the zoning capabilities of the Evohome system by setting different temperatures for each zone in your home.
    • Adjust temperature settings for specific rooms or areas based on your preferences and usage patterns.
  3. Scheduling:
    • Create heating schedules to automate temperature changes throughout the day.
    • Set different schedules for weekdays and weekends or customize based on your daily routines.
  4. Adaptive Learning (if applicable):
    • If your Evohome system has adaptive learning capabilities, let it learn your preferences and adjust heating schedules accordingly.
    • Adaptive learning can optimize energy efficiency by adapting to your habits over time.
  5. Away Mode:
    • Activate the “Away” mode when you’re not at home to save energy. This mode lowers the overall temperature to a predefined setting.
  6. Monitor Energy Usage:
    • Keep an eye on your heating system’s energy usage through the app or web interface.
    • Some versions of Evohome provide energy monitoring features to help you make informed decisions about your heating habits.


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