Is it possible to add hot water tank temperature to heat pump dashboard, I already have it as a feed but can’t see an obvious way to add the history of the tank temperature to the same graph as the other Heat Pump data. I want to achieve a similar result as the Room Temperature or External Temperature.
1 Like
Tank temperature is not currently something that is shown on My Heatpump app, but it is something we could consider adding.
3 Likes
Could contribute to some interesting analysis, comparing external temps, DHW COPs and the tank temp range from start to end of a heating cycle.
Definitely interesting, I have this in a separate Heatpump app where I use tank temperature for the room temperature feed. Would be great to have it included; at the same time a “target tank temperature” feed should be added. It looks like this for me:
2 Likes
I suppose one issue would be the variable sources for those additional properties. Straying further from the MID metering accuracy perhaps.
I know the PT1000 connected to our myenergi eddi reports a higher temperature than the Vaillant sensor when located in the same cylinder pocket or ambient air.
1 Like
Hi Tim, is here any progress ? This would be a really useful parameter to add into a chart. Since we can have separate DHW and space heating daily splits this would be great to have this feature. Thx.
1 Like
I’m using a Zigbee temperature probe sensor in an extra pocket nearer the top of my DHW cylinder. I port the signal via Home Assistant to my heat pump app using the ‘Emnocms History’ integration and use the ‘Target’ feed to display it in Myheatpump" dashboard.
it’s more useful knowing tank top (tap water) temperature. Here’s an example.
Sorry all previous post should read’
“I port the signal via Home Assistant to my heat pump app using the ‘Emoncms History’ integration.”
Oh the DHW is early in the morning when HP is running on Octopus 'Intelligent GO" tariff.
Good idea, but if you do this doesn’t it make some emomcsm calculations wrong ? I guess you have replaced target water temperature ? I would really appretiate that dhw temperature is added as an additional paramter to the app. I believe it can’t be that difficult for devs, I’m surprised such useful parameter is not integrated.
I don’t think emoncms calculations are effected. I am only adding an additional displayed item from my own independent sensor. I was not using the ‘target’ feed for anything. I did query if that feed could be use re-labelled to ‘DHW temp’ or similar, but apparently not without effecting all users?
Yes but what feed have you replaced to be shown in the graph like DHW temp? Is it the gray one named target temperature or ?
I agree that target room temperature is pretty useless number so it’s a good idea to replace it with dhw temp. thanks for an idea. Now only if we could rename it 
Yes unfortunately it says target but its DHW.
It will mostly be meaningless when comparing system performance as a tank temperature measured at a single location does not tell you much about the water in a tank.
I agree. It’s useful though on my specific system positioned where it is as it gives a good indication of how much hot water we have left
Can I add my +1 to add the hot water temperature to the graphs. The other temps all demonstrate the effectiveness of the heating and flow rates, but without the hot water temps you can’t see how the heating strategy is actually affecting the hot water temp.
I finally got a local development environment going and this is the first thing I’m adding. I’ll create a pull request shortly.
1 Like
That’s brilliant, thank you.
Will this also become available on the emoncms website, or only for self hosted?
I think it could definitely propagate to the emoncms website. I tried to keep the changes minimal to not interfere with the code base too much. I created the pull requests on GitHub. I implemented both the display as well as a tool to estimate the heat loss coefficient of the tank given its volume and ambient temperature of the cylinder room.
Maybe not that useful to others but I have 2 temperature sensors on my cylinder (and upper and lower) so it would be good to be able to show both.
I’m sure some people might even have more than 2 to show the whole story of what’s going on in the tank.
1 Like