Air-to-water heat pump - Nest Thermostat

Leave your personal problems aside. I have already dealt with the topic some time ago, and I have not taken a step back so far. You are not bringing any information here, only polemics. Your assumptions about my interpretation are wrong, and besides, you apparently have not yet dealt with weather-controlled regulation, otherwise this would not be coming up now. By the way, different heat demand is also controlled through the laying of the pipes (spacing), not fundamentally only through valves and ERR.

Aren't weather-controlled thermostats also smart thermostats?

The polemics and the personal "attacks" came from you, my dear. Mycraft and I have explained quite a bit, from you so far nothing - only religious faith.

Facts did not come from you ONCE. Everyone should form their own picture.

The way you present astonishing information bit by bit, one is led to conclude that you are dealing with the topic for the first time - which wouldn't be bad.

Now enough here! What is that supposed to be? I totally lost track. Can someone briefly summarize again why an ERR with an air-water heat pump with room air-independent chimney is nonsense? And what happens in the worst case when operating something like that? Because of your jabs, I've lost the information.

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I join and ask you to settle your disputes. We do not want a cuddly forum here, but the undertone of your conversation is gradually drifting into mutual accusations, and that is currently not the purpose of a public exchange.

It is one thing to have different opinions. But if "you" cannot even read each other or agree on the smallest common denominator, you should leave it; at least resolve it outside the public area.

Rhenish greetings from the road

Enough is enough here! What is this supposed to be? I’ve completely lost track. Can someone briefly summarize again why an ERR for an air-water heat pump with a room air-independent fireplace is nonsense? And what happens in the worst case when operating such a system? Because of your snide remarks, I lost the information

As already written above, with ERR the underfloor heating swings in the range of several K and without ERR only in the range of about 1K; there is no constant heating up and cooling down. The desired temperature is set once and maintained. Just look at the two curves I posted...

If you go on vacation, you have to set this on the heating system; then it goes down to frost protection mode or setback mode for the duration, depending on what you set.

The fireplace is a troublemaker and actually cannot be regulated, but due to the self-regulating effect, the room with the fireplace, when it is on, doesn’t absorb any more heat anyway, the room will overheat, but if no ERR is present nothing else happens except perhaps minimal gains and removal of excess heat... with ERR the room is cut off and separated from the system until the air temperature in the room falls below the set value minus hysteresis, meaning the floor cools down. Then the ERR switches again and heats the room back to the set temperature.

Without ERR, the room also overheats but somewhat less and does not have to be reheated afterward because it never cools below the set value since it is never separated from the system.

I hope you understand it now.

And well, another disadvantage of the whole thing is the pointless electricity consumption for all the control components.