1-2-4-interface

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schalterDev / smart-junkers-boiler

Replace the Junkers TRQ 21 room thermostat with a Shelly Plus Uni on the 1-2-4 interface — smart, 4-level control for older Junkers/Bosch gas boilers (ZWR, ZSBE, ZWN). Ready for Home Assistant. DS18B20 room temperature included.

iot smart-home ds18b20 diy home-assistant bosch heating junkers shelly junkers-bosch gastherme trq-21 1-2-4-interface shelly-plus-uni modulating-boiler

Updated Apr 30, 2026

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