Vaillant ASHP hybrid system, what should heat curve be set at?
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Welcome! The best one depends on your house. Reasonable starting points are whatever the installer set, if they set anything, or whatever makes it start heating at your desired max outdoor temp for heating (so that is 32c flow for 12c outdoor on my pump of another brand) and the curve pass through whatever your design temperature was (I think mine was 48c flow for -2c outdoor). Then watch your emoncms heat pump app graphs and adjust until optimised.
Searching this site for Vaillant may find users explaining how to set the curve on your controller.
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