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I've got ebusd reading the flow and return temperatures from the boiler (red and Green) (Vaillant EcoTec Plus 637) and some thermocouples on the pipes about 1.5m away from the boiler (yellow and blue). The flow as reported by the boiler is matching the thermocouple both when the boiler is off...

We currently have an "old fashioned" system with a Vaillant EcoTec 637 (Way oversized), a timer for the radiators (with room stat in hall) and vented HW cylinder (with tank on/off stat) + a programmable stat for the UFH In discussions with the Vaillant technical people I think the solutions...