Yes, the bathroom and guest room are always open. Well, the 32°C return flow and 37°C supply flow are only operated for a relatively "short" time in cycles when the mixer closes. The cold return flow, which comes into the buffer from the underfloor heating, causes the average buffer temperature to stabilize after the heat pump adjusts. Nevertheless, the average temperature level is already high, so the system defrosts relatively often and, of course, the power consumption is increased. Last winter I had completely different settings ;) Recently, at around 0°C, I had a consumption of about 30kWh/day including hot water, which is why I am now trying the above settings (which are recommended). Unfortunately without real success... The 5K buffer overcharge is, by the way, the recommendation of the customer service!