Bosch Smart Home room thermostat II

[Pijnacker]

Is it correctly understood that if you have a Bosch Smart Home room thermostat II and e.g. 5 Bosch Smart Home radiator thermostat II connected, then it is the room thermostat that determines how much the radiator thermostats must be open, and that it always sets the same opening percentage on all 5 radiator thermostats, and that the temperature at the individual radiator is not taken into account, thus that a radiator thermostat is forced to be open even though the desired temperature has been achieved locally at the radiator.

[WHasse1]

Hallo Pijnacker, 

ja richtig verstanden. In deinem beschriebenen Fall übernimmt das Raumthermostat II die Messung der Raumtemperatur. Die angeschlossenen Heizkörperventile folgen den Vorgaben des übergeordneten Raumreglers. Richtig ist somit, dass alle Heizkörperventile den gleichen Öffnungsgrad haben. Dieses Regelverhalten kann bei großen, verwinkelten Räumen schon mal dazu führen, dass z.B. in Nischen oder Ecken die lokale Temperatur von der am Raumthermostat gemessenen Temperatur abweicht. Es ist also wichtig, den Anbringungsort des Raumthermostates mit Bedacht zu wählen. Man kann auch den Raumregler auf einen Tischaufsteller zu montieren um bei Bedarf den Aufstellungsort schnell zu ändern, z.B. am Abend mit in die Fernsehecke oder am Tag auf den Esstisch zu stellen...

Hier sind in einem Raum (Wohzikü) drei Heizkörper und ein Raumthermostat, alle Ventile haben den gleichen Öffnungsgrad:

[STdesign]

Not completely right. If there is a bigger difference of the local temperature at radiator thermostat compared to the temperature measured by room thermostat, the opening value of the valve will be different until the temperature difference is adjusted.

Unfortunately, I do not know the threshold exactly. I guess it should be approx. 0.7 ... 1 °C. I can recognize this behavior each winter, e.g. after opening windows for ventilating.

[Geomo]

We have started the heating season as well. I can confirm @STdesign description. Actually in our living room with RT II and 2 HKT II: 1 HKT II 100 % and the other 0 %. The local temperature will also be considered.

[Pijnacker]

My perception was as WHasse1 describes.
We have a house with a large open ground floor with a number of radiators and often experienced that all thermostats were at 80% even though some radiators were in an area where the temperature had long been reached. Therefore I have now removed the room thermostat.