Even the 45°C he considers a problem. Because the screed is damp, a lot of energy is already being withdrawn. Also, the hydraulic station, control system, etc. are of course already inside at extreme humidity. I personally consider it unproblematic and suspect that he just doesn’t feel like dealing with it and wants to do it the usual way, which means using an instantaneous water heater. Naturally, I pay for the electricity. ;-)Oh really? Why is that? According to protocol, it must be at a maximum of 45°C flow temperature for 6 days and otherwise 25-35°C for a total of three weeks. So except for the 45°C, it’s basically something it’s supposed to be able to do anyway in normal operation at maximum outside temperature. Maybe he still has an old protocol in mind where it needs to be at 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 then? Yeah, let me know when Vaillant replies, I’d be interested too...
But did he then use a separate instantaneous water heater or the heating element of the heat pump?