My Heat Meter: Introducing and connecting to Home Assistant

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In this video, I introduce you to my heat meter, which I had installed into my heating system alongside my gas boiler. It's a Kamstrup Multical 403.
I give a brief run through of what a heat meter is, what it does and I take you through the main parts.
Once it's installed (which was done by a professional plumber), I show how I use a Raspberry Pi to read the MBus interface on the meter to extract the temperatures and power rating.
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Video Notes:
More wobbles with sound as I didn't use my Rode microphone for some of the garage recording, but thankfully Shotcut me clean some of it up. The background noise filtering I just couldn't figure out, so I need to learn how to do that. In iMovie it was a checkbox :).
Timecodes:
00:00 Introduction
00:30 What's a heat meter?
05:54 A closer look at the heat meter itself
08:18 A little bit about MBus
10:25 The installation
12:34 Connecting the Raspberry Pi
24:41 Publishing to MQTT
28:25 Subscribing to messages in Home Assistant
34:15 Wrapping up

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Опубликовано:

24 июл 2024

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Комментарии : 25

@justatiger6268 Месяц назад

OMG, this is EXACTLY what I've been looking for! What a great video!

@tomasmcguinness Месяц назад

Good to hear!

@Johan-bb4sy 8 месяцев назад

Interesting approach to be able to measure the energy flow. There are also modbus RS485 to USB adapters that you can plugin in a HA server and use the modbus integration.

@tomasmcguinness 8 месяцев назад

I didn't know that. The RPi is good enough right now, but it's good to know I have the option to integrate directly!

@gopikrishnayogarajah 8 месяцев назад

Super interesting ... got myself a 403 exactly for this purpose to right size my heat pump ..saved me hours of researching to get it into HA/influx.. thanks

@tomasmcguinness 8 месяцев назад

Awesome! Glad the video was helpful!! I assume you’ve got a gas boiler like myself?

@gopikrishnayogarajah 8 месяцев назад

@@tomasmcguinness Yes indeed 35KW monster Worcester CDI system boiler !

@tomasmcguinness 8 месяцев назад

Same 🤣

@gopikrishnayogarajah 8 месяцев назад

@@tomasmcguinness I have the older classic version where your 10K trick won't work. Using the ems bus thinggy with HA to control PDHW. That makes it more desperate to get rid of this boiler :) ha ha

@barrylambe5319 8 месяцев назад

Interesting video

@tomasmcguinness 8 месяцев назад

Glad you think so!

@peterjefferies6720 2 месяца назад

HI Tomas, great set of videos. Really helpful. I am about to do the same on a heat pump which appears to be massively oversized and inefficient. Did you need to buy the communications module for the heat meter or can you get the m-bus data direct from the meter?

@tomasmcguinness 2 месяца назад

Thanks! When I purchased my heat meter from OpenEnergyMonitor it came supplied with a M-Bus => USB module. I then found an old Raspberry Pi 3 and wrong a simple python script that reads the MBus values and publishes them onto MQTT. This is the unit I received - shop.openenergymonitor.com/m-bus-to-usb-converter-heatpump-monitoring/

@everuss 8 месяцев назад

Hi.. looking very good.. have you tried using node red with modbus pallet installed.. might be easier to filter the address's you need? Also change the integer to decimal value.

@tomasmcguinness 8 месяцев назад

Didn’t even know NodeRed had a modus thing. I’ll certainly take a look! Thanks!

@michaelmcgoldrick78 7 месяцев назад

Hi Thomas, great videos..im curious about adding a heat meter as well. Ive home assistant already on a pi. Is there a way to integrate the hest meter with WiFi/ha without using another pi?

@tomasmcguinness 7 месяцев назад

I’m not entirely sure. The Heat Meter I have uses MBus, so all you need is a way to get this data into home assistant. I just use a Pi as it’s a convenient way to get the MBus talking via MQTT. If your heat meter was beside your Home Assistant PC or Pi, you could probably connect it directly!

@Chatterisdotbiz 6 месяцев назад

Hi Tomas, since first watching this I now have HA up and running monitoring basic flow and return temperatures. The next thing is to try and emulate what you have done , reading on Open Energy site it suggests a qp of 6M3 if above 17kW, which mine is (18kW) when PDHW is charging the cylinder, however yours is 2.5. Have you set your boiler to 11kW or less hot water charging output or it works fine no matter as your not interested in non central heating performance as it wouldn’t be condensing, interested in your thoughts.

@tomasmcguinness 6 месяцев назад

I was looking at the flow rate mainly, rather than the pressure drop/resistance. I checked with OpenEnergyMon and they recommended the model I have. I have also range rated my boiler so it's *max* output would be 17.5, which is never really reaches anymore. I understand a little more about it all now (having done a 2 day course). The heater meter should be able handle the flow I need for about 7kW at dT 5. That is what I'd get from a heat pump, so I was kinda planning ahead. As my dT is a little wider (about 8 degrees), the flow is less than 1m3/h, which is within range for all the heat meters of the 403 range I think. Still getting to grips with this stuff. And you're right, I'm not interested in the heat being delivered for hot water. I don't use the gas to recharge the cylinder that often as the immersion takes care of it in the morning (it takes longer, but is cheaper at present). Let me know how you get on! I'm getting a good feel for my own house now and the heat loss is about 330 W/deg C at best guess, excluding heat from people/appliances/etc. so it's probably a little higher.

@johngreen1060 8 месяцев назад

I see you're using Mixergy cylinder. How would you monitor temperature of a regular unvented cylinder. Any ideas?

@johngreen1060 8 месяцев назад

Myself, I'm using a Tesla T-Smart immersion thermostat, mainly for its WiFi temperature sensor. Great idea on paper but very unreliable for monitoring temperature, especially when it loses connection when heating water.

@tomasmcguinness 8 месяцев назад

Before my Mixergy is used three probes, which I taped to the inline, outlet and one of the unused outlets about midway up.

@johngreen1060 8 месяцев назад

@@tomasmcguinness Thanks, any specific probes?