A boiler's second heating circuit controlled through Tasmota
A contributor used Claude to extend Tasmota's OpenTherm driver with second-circuit temperature control and reporting, then tested it on their boiler.
Credits
Earliest dated source:
The full story
Tasmota could enable the second heating circuit but did not send its flow-temperature setpoint or read its flow temperature. The contribution connects those existing OpenTherm data identifiers to the driver.
The author explicitly credits Claude and reports tests on a MAN ProCon boiler with a Siemens controller and an OpenTherm master shield, using ESP8266 and ESP32-S3 hardware. Those tests concern the author's particular installation, rather than validation across other boilers.
How it was done
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Sources
From the maker's own write-up or code. We summarise what they report; we haven't tested it ourselves.
- Tasmota Project: OpenTherm: support the second heating circuit (CH2 setpoint, CH2 flow temperature, ot_ch2)Source byline: pebl-hankPublished
The contributor’s pull request, including its AI disclosure and test notes.
- The code: github.comRepository account: arendst
Linked in the post.