ESPHome OpenTherm Thermostat
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ESPHome OpenTherm Thermostat

In today’s smart home revolution, thermostats play a key role in optimizing energy use and maintaining comfort. While there are plenty of ready-made options, building your own thermostat is an exciting alternative. The DIYLESS Thermostat offers a perfect blend of flexibility and affordability, making it an excellent choice for enthusiasts. When paired with the versatility of ESPHome firmware, it unlocks endless possibilities for customization, ideal for tech-savvy DIYers.

OpenTherm Thermostat firmware v1.10
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  • DIYLESS
  • 2/25/2024

OpenTherm Thermostat firmware v1.10

A new v1.10 is ready to update.

OpenTherm Thermostat Initial Configuration
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  • DIYLESS
  • 10/19/2022

OpenTherm Thermostat Initial Configuration

Web configuration allows you control boiler and set-up WiFi connection, Home Assistant integration and MQTT broker settings

OpenTherm Gateway basic example
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OpenTherm Gateway basic example

Today we will use an OpenTherm Wi-Fi gateway to monitor commands issued from OT enabled thermostat to the boiler. Also a simple example of override will be shown. You can use/extend this sample to temporary shutdown heating or set it to maximum bypassing wall unit. To store the history we will use a ThingSpeak cloud.

ESP32 Tasmota OpenTherm Thermostat BLE
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ESP32 Tasmota OpenTherm Thermostat BLE

In the previous article we have created a simple opentherm enabled thermostat which uses an internal temperature sensor and controls boiler temperature to reach more comfort without indoor overheating and thus reducing gas bill. However you might want to control heating in a room, than does not contain wall unit or wall temperature sensor. For instance you're upgrading heating system in existing house and no new wires can be installed. So let's use one of the Xiaomi's fancy BLE-enabled temperature sensor to help improve your heating automation.