Drayton Wiser Home Assistant Integration

Third party integrations
892

Unfortunately I don’t have an opentherm boiler and this protocol is a bit of a closed shop, but I can say this.

We added opentherm via a github issue for one of our community. They provided the json output from their boiler and we just added some as attributes to this sensor.

If the CH return temp is showing -, then it is likely that your boiler does not provide this info in the data to the Wiser hub. If you want to see what is being provided from the hub by opentherm, you can download the diagnostics and (at the bottom of the file) is the opentherm data from the hub. I suspect that ChReturnTemperature property is not there.

Below is example of data visible in diagnostics download if opentherm is connected (this is the data we used to add to integration - not mine)

{
    "chFlowActiveUpperSetpoint":800,
    "chFlowActiveLowerSetpoint":350,
    "dhwFlowSetpoint":550,
    "dhwEnable":true,
    "featureActions":{
        "ModulationOnboarding":true
        },
    "Enabled":true,
    "transmitter":{
        "messagesSentCount":51728
    },
    "receiver":{
        "decodingErrorsCount":615
    },
    "operatingMode":"OTplus",
    "preDefinedRemoteBoilerParameters":{
        "dhwSetpointTransferEnable":true,
        "maxChSetpointTransferEnable":false,
        "dhwSetpointReadWrite":true,
        "maxChSetpointReadWrite":false,
        "dhwSetpointUpperBound":650,
        "dhwSetpointLowerBound":350,
        "dhwSetpoint":2560,
        "maxChSetpointUpperBound":750,
        "maxChSetpointLowerBound":200
    },
    "ch1FlowSetpoint":350,
    "ch1FlowEnable":false,
    "ch2FlowSetpoint":350,
    "ch2FlowEnable":false,
    "operationalData":{
        "RelativeModulationLevel":0,
        "ChPressureBar":13,
        "Ch1FlowTemperature":330,
        "ChReturnTemperature":320,
        "Dhw1Temperature":275,
        "SlaveStatus":0
    },
    "roomTemperature":191,
    "roomSetpoint":190,
    "TrackedRoomId":7
}

I cannot tell you what Modulation Level means but maybe someone with more expertise on opentherm can. If you get anymore info and we can add or amend some of these parameters to help you, please let us know via our github issues.

893

Frank, in general, if you can’t get the secret by the method in the instructions, then I don’t think it is compatible.

894

Thank you @msp1974 for such a quick reply.

You are correct regarding the ch return temperature. I don’t have “ChReturnTemperature” entry in my diagnostic download, so the boiler isn’t providing it.
Real shame because I think if I could see that it would give me some indication that the boiler was in condensing mode. Not that I have any reason to doubt that it is.

895

In case it helps, although you would have to buy one if you don’t own one already, you can check boiler flow and return temperatures (as well as radiator flow and return temperatures) independently of the integration using either a digital k-type pipe clamp thermometer, an analogue pipe clamp thermometer, or an infrared thermometer. Obviously these are examples only and there are plenty of choices, especially of the infrared type ones. However, I do own that specific infrared thermometer and it works well considering the price.

1 Like
896

Thats a nice idea… how much were the bits? and any recommendations? Id be tempted to use esp8266s/32s with esphome, but that entails powering them… (which should be ok given the boiler will have 240v nearby)

897

Thanks for the suggestions.

I already have a digital k-type and infrared thermometers. I also have a spare esp8266 and temperature probe so I’m well equipped to set something up.

898

I only have an infrared thermometer, the one linked, which can obviously only be used for manually checking the temperatures. I had this already and didn’t buy it specifically for checking flow temperatures. However, I would imagine you could potentially buy a digital pipe clamp thermometer and connect it to an ESP32 to feed the values into Home Assistant.

It’s not something I have looked into, although I am interested in finding a similar solution to monitor the temperature of my hot water tank to see how much ‘charge’ is in it and automatically boost the hot water e.g. after someone has had a bath and mostly emptied it. I haven’t found a good solution for that yet, mainly as my hot water tank is one where the insulation is integrated into it below an exterior shell, so very very thermally efficient, but not easy/possible to get a thermometer onto it without compromising the shell. A pipe clamp on the exit flow might work, but wouldn’t be very accurate I don’t think, unless water was flowing through it. Therefore, I’ve actually temporarily abandoned that idea and am thinking of using a humidity sensor in the bathroom and ensuites instead i.e. when the humidy has increased 20% above the ambient humidity of the house, someone has either taken a shower or had a bath.

899

Happy to help. Feel free to ask questions and I’ll let you know what information I can share. As for future developments and the roadmap, it is super exciting and again I’m happy to receive suggestions.

2 Likes
900

With the Merten version you will be able to obtain the secret key the same way as the Drayton version.

EDIT: I just read your question again and the important point I missed was “Wiser Home Touch”, sorry. The Home Touch is a different platform and will not be supported the same as the Wiser Home devices being discussed here.

1 Like
901

On the disconnection topic. Once we know your MAC address the support team can use a tool to generate a support package. With that we can see if there is anything obviously wrong. If you want to send me your MAC address via direct message I will log it with the development team. I can’t promise a speedy investigation and resolution but I can promise the team will take a look.

3 Likes
902

Pete,

You will have seen the LTS sensor showing none if off was in v3.1.6 released yesterday.

The other issue of getting the error when setting preset modes I think will be fixed in HA 2022.10.0/1 as the PR was merged into the HA fronted dev repo today.

2 Likes
903

Earlier in this thread there was some discussion about the accuracy of room temperatures for rooms where only iTRVs are measuring the temperature.

I’ve been tracking temperature sensors in iTRVs, Room Stats and a Sonoff Temperature and Humidity sensor I have and noticed the following:

It would be great if we could calibrate the iTRVs manually to account for the measurement difference. Perhaps putting the roomstat in the same room as iTRVs for a week could calibrate them?

Or release a much cheaper interface free version of the roomstat. £75 per room is too much.

Edit: I just moved my Sonoff into the Hallway, so I can compare the measurement by Wiser based on two iTRVs. I will add a graph soon when it has had time to gather the data

2 Likes
904

It’s still early days, as I’ve only had the system installed for a week and a half, but I’m actually thinking of removing the room thermostat completely (I only have the one that came with the system), as it seems pretty redundant if you’ve got iTRVs on every radiator, as well as fact the display only turns on if you physicallly interact with it. Plus, superficially, it’s not exactly the nicest looking bit of smart home kit. That way you just set the temperature to whaever feels the right temperature and all rooms, in theory, should be of a fairly consistent temperature, even if the readings are out.

I’m thinking it’s another reason to create my own smart home display using a Home Assistant dashboard on a wall mounted tablet, which would allow control of all rooms and be far more useful than room thermostats in each room.

1 Like
905

That feels like a good idea, and at the moment you could do this for all rooms without a roomstat.

I think it would better pass the family test if the figures were more accurate. I can do the mental arithmetic that rooms should be set to 20 degrees if I want 18, but someone is going to read an article about turning the temp down to 17 to save energy and do it…

1 Like
906

LOL. Yes, the WAF (Wife Acceptance Factor) is always important. Strangely, I’m actually finding that setting the iTRVs to 19.5 - 20 degrees is plenty warm enough. Based on your measurements that would suggest that they are actually at 18 degrees. I will need to put some separate thermometers in a few rooms and check what the actual temperatures are. I have a couple of Aqara Temperature and Humidity sensors (they can be picked up for under a tenner on AliExpress) kicking around somewhere. I’ll need to dig them out.

Just off the top of my head, the other thing you could do, if removing the room thermostats completely, is create a template thermostat for each of your iTRVs that’s calibrated correctly and put them on a smart home display. As I say, just a thought, but I have template sensors for loads of stuff to ‘fix’ things that are not quite right. :laughing:

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907

actually Im the opposite. I find the temperature much more accurate with the thermostat than the TRVs. The accuracy depends on the room itself (ceiling height etc). I think a good enhancement on the wiser side would be to allow a custom “delta” at the trv level. e.g. TRV thinks its 19C but its really 17C so a setting would add -2C to any readings…

We have a workaround using this integration etc but be good if the trvs supported manual deltas (Eq3Max does)

edit : Just noticed @dunxd mentioned the same above :slight_smile:

2 Likes
908

Agreed, allowing us to calibrate them to suit the room is the best solution, and what feels comfortable will depend on room size, ceiling height, insulation and probably, most simply, just how ‘drafty/leaky’ a room is.

Template thermostats may be a solution of some sorts, short of Wiser building this facility in. I would need to actually do this and test it to see if it works. It’s just an idea that popped into my head as a possible solution/workaround. As I say, early days and still learning how everything works.

1 Like
909

Good analysis and pretty accurate apart from the comment on just one iTRV. Let me explain what happens in the different scenarios:

  • iTRV only room: There is a smart algorithm on the iTRV itself with compensation for being near a radiator for a reasonably accurate current temperature. Of course this is an algorithm and the device is next to a heat source so will not always be as accurate as a measurement away from the radiator.
  • Multiple iTRVs in the same room: We take an average across all iTRVs in the room for the current temperature.
  • iTRVs and Room Thermostats in the same room: We use the Room Thermostat for the current temperature because if it is installed per the user manual (at the right hight, away from direct sunlight etc) it will be the most accurate.

The request to allow offsets is a good one and I’ve heard it in the past. It is on our backlog for review but isn’t planned yet. A work around is of course to set the room temperature to slightly higher if you feel the room is always a little too cold.

As for other, cheaper measuring-only devices, good suggestion, we hear you.

4 Likes
910

@jamiebennett my top asks from Schneider are :

  • Ability to add “delta” to TRVs so we can accurately calibrate them for the room
  • Add Geolocation to the App to control the Away Mode. IFFT is rubbish, it doesn’t cope with multiple users. Life360 did but its like selling your data to google… Currently I use Home Assistant Automations to detect if any one is home and then set the away mode using this integration… but I think native would be nice and compensate for the fact my 7yr sometimes disconnects the PC home assistant is on…
3 Likes
911

Another on our backlog too but not in our current development pipeline. Something we want to do for sure.