Hello jo-me,
in my flat i have installed 5 Zwave Eurotronic Spirit Z thermostats on normal radiators since last year. The one in the bathroom was installed 2 years ago for testing purposes. They are connected to HomeAssistant via an Aeotec Zwave USB stick.
All of the thermostats run application_version 0.16, except the slightly older one in the bathroom which seems to run on 0.15.
I just installed them via the normal Zwave integration process. Although the way the climate component and the nodes offered by the thermostats worked together was somewhat unintuitive in my opinion, i got everything working in my automations.
Here everything is working as it should. I do not have any data from this heating period, since we did not start heating yet, i can’t remember a behaviour as described by you. For a selected “hvac_mode” (off, heat) i just set the target temperature an then the thermostat adjusts itself accordingly. No extreme overheating or otherwise erratic behaviour.
But i do have to admit i don’t really know about the valve positions. Nothing in all settings tells me about the valves, although i slightly remember having read about revealing the valve attributes/postion 2 years ago, when first starting with these thermostats.
On the other hand i can just tell you from my experience last season when staying in the living room / on the couch. The radiator is positioned right beside the sofa so i can hear the device adjusting. On starting to heat up the room, of course the valve opens to heat up and when the target temp is reached it adjusts down to hold the temp, but it doesn’t close completely. And from time to time i can hear a very small adjustment in the valve to compensate the target temperature. So it is neither switching between boost (100%) and off all the time nor is it powering at 15%, as one of your linked articles mentioned.
Maybe you could help me out and tell me what you mean by “comfort” mode?
Summary:
Despite strange entities and logic (climate.furnace, climate.heat, climate.heat_eco and so on) and a change in the offered services somewhere this year (hvac_modes did not exist with this device last year) the thermostats in version 0.15 and 0.16 do what they should do in the way i expect them to do it. Here i do not control valve positions directly but rather go with target temperature and let the thermostat do the rest.