Oh really? Why is that? According to the protocol, it must be no more than 45°C flow temperature for me for 6 days and otherwise 25-35°C for a total of three weeks. So except for the 45°C, actually something it should be able to do at maximum outdoor temperature even in normal operation. Maybe he still has an old protocol in mind where it’s supposed to be 60°C? And how does he want to do the functional heating then? With an instantaneous water heater? Will he pay you for the electricity? Yeah, tell me when Vaillant responds, I’d be interested too...