This shows the controls that I have for the Ariston Nuos WiFi:
And this shows the sensors:
Hi, I have the Ariston Clas One methane boiler. I don’t have any physical thermostat: I control the heating with a shelly 1 connected to the thermostat pins (on/off) and a generic thermostst entity in home assistant with a zigbee temperature sensor. It works well since 2018.
I wanted to know, what advantages would I have if I switched to bus control? Just being able to adjust the water temperature? Or could I also improve the boiler’s efficiency in some way?
What hardware do you suggest I buy? It’s not possible with a simple D1 Mini/ESP32, right?
What would be the best hardware solution to purchase? I guess I’d have to disconnect the Shelly afterwards. Thanks.
Hi, if you just start and stop the boiler this integration will not give you much more.
You probably will be able to gather metrics from the boiler and make some graphs and statistics but apart from that not a lot more.
You could change settings like temps, set points and so on but these variations are done once in a while and this can be done directly from the boiler display.
If you have an external probe and if you use it for the climatic thermoregulation you can use the metrics gathered to tune your settings.
Is there a way to improve the boiler’s efficiency switching from my “on/off” logic to this integration?
The integration I helped to setup is not mandatory to get better results. I stress that in my view for critical features of an home there should be no amateur geek logic involved. I leave the day to day running of my (hybrid =complex) system to builtin thermostat and probes.
There is scope for improvement from you starting point. How much depends on too many things so no forecast available but, in principle, if your boiler after a while keeps turning off the heating flame this means that Leaving water temperature set point can be lowered , with lowers temps the condensing should be better and the efficiency improved.
You’ll need at least an external probe to detect the temp outside, and if possible an internal Ariston thermostat to broadcast on the bus the actual room temp.
The external probe costs around 20 euros and is connected by a simple 2 wire cable.
Internal bus enabled thermostat around 100€.
The adapter to tap into the bus costs another 25/30€ shipped. This is in my view an highly recommended feature if you want to go for the climatic regulation otherwise you risk to spend more or taking too much time to get the optimal results.
Ok you convinced me, I’m getting a cube net s and the external temperature probe. Already in this way I can manage the thernostst via Home Assistant with the Ariston integration right?
Compared to the current situation I should be efficient as the boiler can modulate the flame based on the data received. Do I say right? Via Home Assistant do I act on the target room temperature to adjust the on/off, is it correct?
Having done this, the next step will be to buy the bus adaptor and use this integration. At this point, what else would I have? Reading operating data or further settings?
Thank you very much man
You are giving me too much faith 
I don’t have that boiler so take what I write with caution, ask to an expert if you want “certanites”.
I base my answer on the online manual from Ariston, the source is this:
With the cube net you will be able to act on some parameters of your boiler (on/off, setpoints, DHW comfort) while away via their cloud platform and their App (I use it quite efficiently to program the schedules), on top of that you can use the HA-AristonCloud integrations, there are a couple, check with their developer/documentation if your appliance is somewhat compatible with these. On top the thermostat will be able to send to the boiler the detected current room temperature, the boiler will be able to modulate better, when the room is colder it will heat more, when warmer heat less.
It’s important for this use case that the cube is positioned in an heated room, better if it’s the living/dining room or a central place in the house where is less influenced by other heat/cold sources (cooking zone, external doors etc)
The external probe instead will enable to set the boiler to respond to ambient temp, thus more heat if outside is cold, less if warm.
Take a look at Page 22, example 3 in the aforementioned manual.The settings for this configuration needs a little patience as:
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there are no public “official” manual, there is one but is reserved for Ariston certified installer and I haven’t been able to find it on the internet.
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there are no default by themselves as every house is different, different climate, location, insulation, solar exposure etc
I have prepared a little guide on how to do it, it’s mainly focused on HP based plants but it can be a starting point even for boiler configs (you can avoid to search the optimal minimum temp as it is almost meaningless in a boiler only system)
Hope it helps
Thanks.
I received the external probe today and should receive the Cube Net S tomorrow. I’ll assemble everything as soon as I have a moment. If I understand correctly, after installing the Cube Net on the “bus” pins, I need to bridge the “TA” pins where I currently have the Shelly connected…
Once everything is assembled, regarding the heating water temperature, should I leave it on auto so that the external sensor regulates it?
Once this is done, we’ll see if we can also connect the bus interface, one thing at a time.
I installed the cube net s and the external probe. It seems ok.
NOW I have to buy the bus card.
Which One do you suggest? If it can be used in the house I have some d1mini
Edit:
The eBUS Adapter Stick C6 is it good? Does it work standalone? eBUS Adapter Stick from ebusd.eu
The adapter is good, I use the shield version but if you intend to use it via Wifi it’s good.
read the OP on placement and wiring. After the adapter you’ll need to setup ebusd to translate the data flow from the adapter to HA entities and statuses.
Please read the cube and boiler manual (all of it) then read the linked guide I prepared.
BTW this thread is on Ariston integration in HA via ebus, not really pertinent on how to optimize a boiler gas consumption
There are forum dedicated for this.
Thanks i will buy it.
A question, do you know if I will be able to read the gas consumption (smc) ?
It depends on the boiler FW but on mine I’m able to detect the boiler energy produced in KWh so it’s a matter of translating it to gas smc.
I’m sure of the metric values and meaning because these are reflected in the thermostat diagnostic pages but be aware that the protocol has been partially reverse engineered so no warranty.
Thanks, helpful. Is it possible to control the SG-Mode also? I’m trying to integrate the boiler in EVCC. But the only option i now have is ‘Boost’, which is inefficient. I’d rather have it use HP only.
I received the adapter today. I’ve plugged it to 5v adapter and set up Wi-Fi (static IP) and MQTT. If I understand correctly, I now need to connect it in parallel to the CubeNet thermostat and install the ebusd docker container on my server, right? Does the ebusd container communicate with the adapter via MQTT?
Yes, wire the adapter in parallel with something on the bus.
Start ebusd addon and set the device option of ebusd to something like ens:192.168.X.X or whatever static IP you gave to the adapter (i don’t use the addon so can’t help there) .
Ebusd must be configured to point to the MQTT broker. Then auto-discovery should do it’s magic and entities should appear.
Read more on the GitHub repo.
Thank you, everything is quite clear. This weekend i will try. Just a clarification: to eliminate the sensors that I don’t need, i have to disabile them from homeassistant or is it more convenient to intervene at the mqtt/ebusd level?
Both are viable solutions. In my view doing it in HA is simpler, but the risk is that on some occasions the entities can reappear (change in ebusd sw that alter the MQTT entities names).
Doing it in ebusd is “safer” as the mods should be long standing, but trickier as you need to be familiar with regexp to safely impose filters.
Did you test the connection? Are you getting at least some info from your HVAC system?
Yes man, it is working. In This days I had few time to “play” with This new game but it is working. In the next days i will take a good look at all. In short i have set the ebusd Wi-Fi dongle from it web page, i have set the ebusd docker container and i have a lot of working entity in home assistant