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Opentherm control of system boiler

Hi

Viessmann system boiler - 4 pipe installation (one heating circuit & one hot water circuit to a hot water cylinder)

Opentherm control (via EU wireless extender) seems to be working well and flow temperature optimization seems to have the boiler modulating nicely.

I can set/schedule the hot water temperature via the Tado app, but when I turn off the hot water via Tado app the boiler (via its own diagnostics software) still shows hot water as ‘on’ and always at a commanded temperature of 55C

Where does this 55C value come from? Can I not turn off ‘hot water’ with Tado?

In the Tado app the ‘hot water control’ room shows two devices … the wireless receiver (the zone controller for all the other ‘rooms’) and the smart thermostat.

I am not sure I want the smart thermostat to be a second zone controller (I just want it to act as a wireless temp sensor) but this is where my understanding ends.

Any thoughts on where the ‘on’ ‘55C’ command is coming from?

Thanks