Make HKV adjustable and keep an eye on power consumption

Since I want to work with microcontrollers in the HKV anyway, I will probably also build normally open control valves on most heating circuits that I can, for example, close if there is overheating caused by the sun. Since all thermostats in my rooms run through Home Assistant anyway, control is not a problem.

Why "microcontroller" when HA is involved? Switch or directly PWM heating actuator and off you go. Apart from the fact that your floor only releases heat to the room if the room is cooler anyway. If that is not the case, the heat simply remains in the pipe because there is no temperature gradient. Have you ever told your plan to a competent heating engineer or possibly asked in the Rosa Forum? It still seems somehow not very sensible and rather like a hydraulically balanced system with a shut-off option.

Unfortunately, I come from a region where you first have to explain to a heating engineer why you want a heat pump in a new building. Unfortunately, I don’t have the feeling that I can easily get someone here for an offer or feasibility question. That’s why I’m asking here, so that I only have to look for a heating engineer once I have a concrete order.

I basically understand that the room only absorbs heat when it is cooler. I haven’t heard this from anyone else before, instead I always heard that you should turn rooms down even when there is sunshine. It’s good to hear that my theory doesn’t seem completely wrong. But that was just an example. For instance, I could also imagine closing rooms that are intended for playing and sleeping earlier in order to still have 0.x degrees more temperature drop in the evening than in the other rooms. Or to have the option to set one room a little colder for a certain time because it is not being used at the moment.

PWM and switching heating actuators? My search didn’t really help me much. Are those the kinds of parts that control the entire heating circuit and monitor the individual flow and return lines? If so, then I basically want exactly that but to build it myself as cheaply as possible. Those parts cost over 500 euros per floor, right? An ESP32 costs me 2 euros and a relay board 3 euros. Plus a few control valves and that’s it. I would think that’s less prone to errors, better repairable, and I’m not tied to any cloud or a specific manufacturer?! But I’m open to anything. That’s exactly why I’m asking here. I can completely control my heat pump. On/off/circulation pump/cooling/heating. That’s no problem and it works perfectly. I just lack the possibility to provide heat or cooling to individual rooms at certain times or seasons and especially to temporarily “overheat” individual rooms (bathrooms). I don’t want to keep the bathrooms at 22-24 degrees all day but it’s enough for me if the tile floor is a little warmer by foot for one hour in the evening and morning.

The motorized ball valve only knows open and closed, right? There is no way to set it to half open? I have the same question about the control valves. If they weren’t thermal with open/close but motorized, then I wouldn’t need all the stuff around it. But the ones I find are usually clearly too big to have several of them side by side?!

alright I have now after a long search come across a good commercial offer where I would come to 4 hkv with ~20 actuators at 4*200+~400eur. I then found 2 open source projects that provide the 4*200eur actuators once as fhem and once as esphome project. the control valves could also be found more cheaply there. so this will be it. then the only challenge really remains to combine 2 heating circuits per room into one connection each. still saves one control valve per room and the flow is also halved, which should be absolutely sufficient.