What is the difference between “boiler”, “hot water outlet” and “supply”?
I’m also not sure how this corresponds to the Vicare values. For this screenshot it mentions for “hot water” in Vicare 43° (this is on the 222-W with internal buffer tank), and burner (i.e. heating circuit supply temperature) 34.9°
Hot water outlet might be your hot tapwater outlet but supply is probably your supply of water to your radiators that’s heat your house.
Note the words probably and might.
Boiler I am not sure as I do not have that for my Vitocal 300-G.
Sorry, that’s right, it’s the same for me. 
Hey Kenny,
first of all thank you for that app Kenny! Just sent you a feedback
I can see that for some heaters there’s already the value “Power”. I have a Vitocal 250A and the value is not available. Is it possible to add that one?
Thanks in advance! Happy to share feedback to support you.
BR
Seb
Hey,
These temperatures are mapped as follows in the Viessmann API:
In my installation the boiler and supply temperatures are always equal. I don’t know if there are installations where they differ. I also cannot find the supply temperature back in my ViCare app. If this value is not useful, we can also remove it.
The hot water outlet I cannot find back in the ViCare app either.
Hey Seb,
I would love to add that, but until now every Vitocal device where I got the features list from does not expose the power metrics using the Viessmann API. I suspect it is after some paying plan, even through the API documents that it should be in the free plan.
If you want you can provide me with the features.json / installations.json, which you can generate from the settings and I can look into it if your device exposes it or not.
If the Viessmann API does not provide it, I’m unable to add it sadly.
Kind regards,
Hey Kenny,
Maybe you found this already, but it’s a list of the data points available in the IoT API.
Also if it’s available for a basic plan.
Yeah, I found it, but I also discovered it is not always accurate 
Hi,
There is a public API and a non-public API.
For example, I was looking for the data points for the system pressure and the exhaust gas temperature.
They are both in the non-public API. 
The values are public in the Vicare app and in the viguide.
Nobody understands that.
The “Vitogate 200 KNX” from Viessmann is recommended as a solution. 
The “Viguide” site will soon be closed to normal users.
Could you evaluate this again with next version (v0.8.0)?
I discovered that the unit for gas consumption in older devices is reported as kWh, while newer devices report it in m³. The next version should fix that and report the unit correctly.
Guys,
I’ve published v0.8.0 towards test now, this is a bugfix for gas meters and provides the centralized steps for translations.
Anyone interested in helping in the translation can volounteer, the project is created at CrowdIn (Viessmann dashboard in Crowdin). I might need to give you rights, you can send me your email by PM and I’ll add you.
Kind regards,
Thanks for the explanation!
For my system at least (Vitodens 222-W) I don’t think the boiler temperature and hot water outlet make much sense. Boiler temperature seems to be redundant to supply temperature. And the hot water outlet doesn’t match with the Vicare storage tank temperature. Maybe there is another datapoint that does match the actual Vicare value for the latter?
I’ve made an alternative to Vicare plus’s so called “intelligent heating algorithm”. Basically what I did was make a pd-controller in an homey advanced flow, together with some logic that keeps my Tado radiator thermostats fully opened until a setpoint is reached.
I might code it into a separate PID-controller homey app when (if ever) I find the time.
But it is for sure outrageous that Viessmann keeps this locked behind a subscription. Especially given the very high base prices. And yes, the Vicare server uptimes are a complete joke.
Hello Kenny,
OK, the consumption in m³ is now visible.
(can this value be changed later?)
The temperature for hot water is not right for me. (35.4 C° instead of 44.3 C°)
The power consumption is not right either. (0kWh)
You are on the right track.
It’s a shame that I can’t help more than just report an error. 
Hey,
For the hot water temperature, have a look on the first page where you can set the target temperatures. If you switch there to hot water, you’ll see the current hot water temperature.
The value on the statistics page is not the actual temperature inside the boiler but at the outlet.
In your screenshot I see the power consumption as 6.7 kWh, while the current power value appears blank. However there is a bug in v0.8.0 for the calculation of these values, this will be fixed in v0.8.1.
v0.8.1 published to test, contains these items:
It was also published for certification, so it will land in the store soon.
What does “if they are provised by the API” means? Does not all units have this?
The power metrics are not provided by older Vitocal devices, neither do some other Vitodens devices provide a separation between power usage for hot water and heating.
The supply pressure is only available with the advanced package (which is not free).
