The easiest way to do this is use a raspberry pi, download a hassos image write it to the sd card plug the pi into an ethernet cable to your router power up the pi, wait 90 mins for the system to update, find the ip address of the pi and log into it. This is covered on MANY threads on this site, but you are best using the recommended instructions from the download page.
For the rooms where you want the heater to run, put the same switches that you used for the generic thermostats for these rooms also into a group, you can then use the group status to trigger the heater on/off.
Interesting idea @Crhass. So if ANY of switches is On , the group is On and if ALL switches OFF the group is OFF?
Thatās correct. I use it myself for the same purpose.
No, he needs individual room control and his emergency condition requires that the valves be opened in spite of what the thermostat wants
I misread.
Possibly but that only helps with 3 rooms
I was going to say āuse an older imageā but that wouldnāt help as it will try to update to the latest, hmmmm I think you are buggered!
Please could anyone give me advise? Wandering if I should use hass.io or hassbian/raspbian installation. Is there something what hass.io could give me regarding to my heating project? I used hassbian before but have problem with Python update to latest.
Is latest Python in latest Hassbian or is there some problem in both hassbian or raspbian regarding Python?
Thanks.
All rooms would open the valves when heating is required but the heat would only be supplied if the group is on.
Some have problems with generic thermostat but I have had no issues.
Getting the switch to do what the thermostat doesnāt want can be tricky. I need to do this to open/close valves in summer so they donāt stick. I am pretty certain when I tried the thermostat kept turning the valve off. I will probably need a routine that disabled the automation to turn on the heater and temporarily sets the target temp for all the thermostats very high for enough time for them to open, then puts everything back how it was. Unless thereās a better way.
Yeah, already got that covered
Will write to a virtual switch.
The emergency will write to a binary sensor
And if either are on the valve is on
You want USB boot right? Read this thread.
Thanks @jazzyisj but this is about Resin version.
I wrote before:
I must use old ResinOS version. But this is the dead way. Great - after few years I decide to left Hassbian because is dead and move to Hass.io and it is halfdead - LUCKY ME 
btw. someone talked about nuclear powerplant in my case. HASS.IO is a nuclear power plant. Russian. Maybe called Tschernobyl or so something. CanĀ“t believe there are so many problems with using stupid USB. Thousands of posts about this stupidity around single bunch of scripts 
So please please PLEASE. If anyone could give me helping hand and tell me if there is ANY big advantage using hass.io over standard raspbian or hassbian hass instalation regarding to heating etc.?
If not I will not loose time tomorrow and will install it from a scratch on raspbian.
THANK YOU.
https://github.com/home-assistant/hassos/releases/download/2.12/hassos_rpi3-2.12.img.gz
Write it to an SD card
Put the sd into the pi 3b
Boot it, wait 90 mins
Worry about moving it to another system once your heating is running
Thatās what snapshots are for
Sorry @Mutt but i really donĀ“t want to run it from SD card. It is only about time when SD will die in raspbery. Since Raspbery 1 I always used USB (in 1 and 2 with SD for boot record), but always prefered this method as it is just more stable, faster, without risc of file corruption.
Jiran is your situation right now urgent? Do you have heat in your home right now?
@Mutt is trying to get you up and running ASAP so you have a heating system. Today. What he is suggesting is that you install hass.io on an SD card. Today. Then you can get your heating automation system all straightened out and tested so you have heat. You can then make a backup of your configuration and reinstall whatever operating system and flavour of Home Assistant you want at your leisure but certainly before your SD card dies. Once youāve done that you can instantly copy your backed up configuration files including your spiffy new heating system over to your new installation.
If this is not an emergency, then get your OS straightened out at hopefully @Mutt will have time to help you out then.
Thanks @jazzyisj. It is not urgent. It works - manually.
I really prefer to decide OS first and after make everything solid.
Now I want to decide if IÄŗl use hassbian or raspbian with manual or AIO.
Hass.io seems to be problem more than helperā¦
IĀ“ve been using Hass.io in the same SD card for over TWO years now, running flawlessly. I think itās a matter of card quality, but migrating to a virtual machine running some flavor of Linux is in the works (since I have a Win10 PC running 24/7 anyway).
Cheers
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Yeah, what he said 