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DIY Wi-Fi thermostat from scratch with ESPHome and Home Assistant
How to build a fully functioning DIY thermostat for an OpenTherm boiler with ESPHome and Home Assistant.
Image from https://sippin.com/hvac/hot-water-systems/indirect-water-heaters/ Controlling such a system would seem like a great challenge, but luckily a lot of low-level logic is hidden inside the boiler itself. Placing temperature sensors strategically can help „debug” heating systems and tune some hard to guess parameters like water pump power. In this prototype I decided to limit monitoring to temperature and boiler parameters, since I wasn't able to find an affordable and reliable digital pressure sensor.
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