Telsa T-Smart Immersion Heater

Hi,

Nothing to do with cars.

I’ve just installed a t-smart thermostat in my electric water system.

Sort of works OK, Android app is incredibly buggy though. What I really want to be able to set the mode according to when I’m away or not with HA.

There is a local API, although its not REST so I’m reaaaally struggling getting anywhere with it. Its all UDP based and I’m pretty stuck tbh. Seems a bit easier with node-red, but still, I’m just don’t understand what i need to put in the headers and payload, the documentation isn’t great imo.

Anyone got anything similar working?

Thank you

1 Like

Well, for the benefit of anyone else who gets one of these, I’ve made huge progress. Using NodeRed (which I’ve had to learn from scratch), I’m now able to

  • Discover devices

  • Read control data (set point, current temp, mode, power)

  • Set Mode

Happy to share the nodered flows if anyone wants them.

:slight_smile:
Amanda

1 Like

Hey there! Just came across you post now, relieved to see someone else has been playing with these too!

I’ve played a little with node red but have no idea about UDP at all, if you could share your flows that would be amazing as I am about to get some of these too!!

My immersion heater actually has two elements in it… I presume I am going to need two of the smart thermostat’s? There’s not much info on their website I can see about having two coils!

Hi,
The whole thing has been a bigger job than I thought, make sure you know exactly what’s going on with your existing wiring and controller.

You’ll possibly find that one of the elements (usually the higher up one) is only used for the manual boost. The lower one is probably the one that is connected to the timer and the one thats the one you could replace the thermostat with a tsmart.

You need to make sure you have an existing plugin type thermostat (lucky) otherwise you’ll need to change the heating element too - which is a total pain.

The t-smart performs the same function as the existing timer, so you’ll need to make sure you can bypass it either through re-wiring or by some kind of manual override mode (mine didn’t have this so had to rewire).

Anyway, I have 3 flows.
You’ll need to install timed-counter, buffer-parser and buffer-maker

  1. Discovery Flow (not needed if you already know its IP). Really simple, sends broadcast and listens for responses just so you can get the IP.
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  1. Control Read Flow.
    This polls every minute and gets current temp, setpoint, mode and updates a HA Sensor. It fires HA events if it receives unexpected responses or no response within a threshold.
    You’ll need to manually change the IP in both the ‘Poll For Data’ and ‘Check Source IP’ nodes.
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  1. Set Mode
    This sends the correct commands to the tsmart based on a HA input_select value then sends a control read message 5 seconds later so that the HA sensor updates.
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Hope this helps.

:slight_smile:
Amanda

3 Likes

Thankyou so much for that Amanda, that is indeed extremely helpful! I’m going to put in the order for them now! It really irked me that there wasn’t really any “cleverer” way to control these before these came along! I’ve got a little controller on the wall and no boost button, so I was just going to force “on” at the controller. I suspect the controller probably gives power to the fused wall plugs the immersion coils are plugged in to.
How have you got along with yours? Have you been able to keep it on less than before as you’ve known the temp inside?!

Hi

Yeah, without a doubt this is saving me money. It used to come on every night for a full 3-4 hours or so. Cost me quite a lot in elec.

Now it maintains at 45c, I have a timer and boost button in HA for when I need proper hot water and when I leave my flat, HA switches it into travel mode. So if I’m not in, it doesn’t come on at all (unless it gets really cold).

My system is a heat store so tap water doesn’t come out of the tank, but even if it did, the tsmart has anti legionella feature built in.

:slight_smile:
Amanda

Not directly no. You can set target temp, mode and turn the whole thing on and off, but you can’t directly control the relay as this would interfere with the antileginella feature.

Example 3 - Set Manual Mode and Setpoint

Keep the device turned on: 0x01​

Set setpoint to 15c - 150: 0x96 - 0x96 0x00​

Set mode to Manual Mode: 0x00​

Checksum is: F2 xor 01 xor 96 xor 55 = 0x30

Sender to the device IP: F2 00 00 01 96 00 00 30

Response: F2 00 00 A7

Response message: Acknowledge

Hi Amanda,
Thank you for your very helpful post.
I found that the Hass-Node-Red integration was never recognised by my Home Assistant, so in the end I used MQTT to send the data to HA.
It’s all working beautifully now.
Cheers
Bill

Hello, I’m considering getting a tsmart for immersion boiler. I’ve seen some negative reviews about the thermostat failing and the water boiling over temp / the stat needing replaced. Please do you mind me asking if you are getting on ok with yours? Thank you very much

Hi Kat,
I haven’t had any problems like that, in fact I’ve just bought a second one for my immersions boost element.
When I set it up it was very easy, and the only issue I encountered was accidentally setting the SetPoint at a high temperature, so even though it was on timed for off-peak, it would come on when the water temperature went below the set point. But once I realised that, it’s all great.
If you need help integrating the Node-Red flows let me know.
Cheers
Bill

1 Like

Same here, I bought one about a month ago and all working fine. Using node-red based on the flows on here, (many thanks @Kitkat for that BTW)

1 Like

Just wanted to say a really big thank you to Amanda for sharing this.
I’ve got an insulated unvented hot water cylinder that can be heated by our gas boiler or alternatively by an electric immersion heater. I fitted the T-Smart a while back and have recently set it to come on at night to take advantage of the Octopus Go 00:30 to 04:30 night electricity tariff (currently cheaper than gas).
Being able to see the temperature of the hot water in the app was better than nothing but getting a graph is really useful- I’ve now realised that it only takes an hour or so to heat the tank with electric so I will set it to come on towards the end of the 4 hour cheap window rather than at the start. Also our kitchen is a long way from the hot water cylinder and I can also see a big temperature drop when washing the dishes so I need to do something about that.
Screenshot 2022-04-16 at 17.59.19
I thought Amanda’s instructions were excellent - just enough information for a Home Assistant novice such as myself to get it set up.
One thing maybe worth mentioning. It took me a little while to realise you need the Node Red Companion integration installed, as well as Red Node itself, to get things working. Also I didn’t use the IP address finder flow, I just set the T-Smart to a static IP and put that into the other two flows.

2 Likes

Thanks for sharing this. I have just installed mine.

I think im possibly a little too novice to be able to understand exactly which nodes you have used to put these code example in. Could you share a screenshot of your Flow so i could see which nodes to install.

TIA

Hi, you should be able to copy the json for the flows and import them using ‘Import’ from the top right burger menu.

:slight_smile:

Amanda,
I’ve just bought one of these and have started creating an Addon, which can be installed directly in HA.
I’ve got device discovery, Climate device and mode control. I want to be able to set the Set Point. The docs above suggest the control write needs to send power, mode and set point, but your flows only seem to send mode… any tips?

I kinda didn’t get as far as setting temp. Its def possible, but I didn’t have time to look at how to get node-red to create the necessary buffer values.

OK, thanks. I’ll push on with trying to make it work and share back when I’ve cracked it!

This is what I use to set the temp in 5 degree steps

Hope this export works, not used it before:

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        "type": "buffer-maker",
        "z": "c390b920067b24c5",
        "name": "Buffer Maker Travel",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "name": "item2",
                "type": "buffer",
                "length": 8,
                "dataType": "bin",
                "data": "[\"0xF2\",\"0x00\",\"0x00\",\"0x01\",\"0x00\",\"0x00\",\"0x04\",\"0xA2\"]"
            }
        ],
        "swap1": "",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "x": 770,
        "y": 700,
        "wires": [
            [
                "18e8466c29f5ad1b",
                "5095b4d09cf39d79"
            ]
        ]
    },
    {
        "id": "151059d973ac67ab",
        "type": "buffer-maker",
        "z": "c390b920067b24c5",
        "name": "Buffer Maker Boost",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "name": "item2",
                "type": "buffer",
                "length": 8,
                "dataType": "bin",
                "data": "[\"0xF2\",\"0x00\",\"0x00\",\"0x01\",\"0x00\",\"0x00\",\"0x05\",\"0xA3\"]"
            }
        ],
        "swap1": "",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "x": 770,
        "y": 740,
        "wires": [
            [
                "18e8466c29f5ad1b",
                "5095b4d09cf39d79"
            ]
        ]
    },
    {
        "id": "20bc9ac1ee2197ca",
        "type": "buffer-maker",
        "z": "c390b920067b24c5",
        "name": "Buffer Maker Timer",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "name": "item2",
                "type": "buffer",
                "length": 8,
                "dataType": "bin",
                "data": "[\"0xF2\",\"0x00\",\"0x00\",\"0x01\",\"0x00\",\"0x00\",\"0x03\",\"0xA5\"]"
            }
        ],
        "swap1": "",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "x": 770,
        "y": 660,
        "wires": [
            [
                "18e8466c29f5ad1b"
            ]
        ]
    },
    {
        "id": "18e8466c29f5ad1b",
        "type": "delay",
        "z": "c390b920067b24c5",
        "name": "",
        "pauseType": "delay",
        "timeout": "5",
        "timeoutUnits": "seconds",
        "rate": "1",
        "nbRateUnits": "1",
        "rateUnits": "second",
        "randomFirst": "1",
        "randomLast": "5",
        "randomUnits": "seconds",
        "drop": false,
        "allowrate": false,
        "outputs": 1,
        "x": 1040,
        "y": 640,
        "wires": [
            [
                "da01ad49dc512494"
            ]
        ]
    },
    {
        "id": "da01ad49dc512494",
        "type": "link out",
        "z": "c390b920067b24c5",
        "name": "Trigger Control Read",
        "links": [
            "28d7afb9ddb08b9d"
        ],
        "x": 1215,
        "y": 440,
        "wires": []
    },
    {
        "id": "e421a022.94f95",
        "type": "server",
        "name": "Home Assistant",
        "version": 4,
        "addon": true,
        "rejectUnauthorizedCerts": true,
        "ha_boolean": "",
        "connectionDelay": true,
        "cacheJson": true,
        "heartbeat": false,
        "heartbeatInterval": "30",
        "areaSelector": "friendlyName",
        "deviceSelector": "friendlyName",
        "entitySelector": "friendlyName",
        "statusSeparator": "at: ",
        "statusYear": "hidden",
        "statusMonth": "short",
        "statusDay": "numeric",
        "statusHourCycle": "h23",
        "statusTimeFormat": "h:m"
    }
]
1 Like

Awesome, thanks for this. I’ll convert from NR into my python addon!

1 Like