Vaillant Arotherm Owners Thread

[Timbones (Tim)]

Here are a couple other threads that may be of interest:

Vaillant inbuilt monitoring vs MID meters

Following on from Adam’s HeatGeek video https://www.youtube.com/watch?v=RlcvncWvNUQ. Im wondering where we are on the question of the accuracy of Vaillant’s inbuilt monitoring vs results from MID approved electric and heat metering? Im not familiar enough with Vaillant’s inbuilt monitoring to have a clear view either way, but get the impression that there’s quite a bit of variability? @Zarch you posted some mixed results on your blog: How to Measure Vaillant Arotherm COP - Energy Stats UK Dec…

tl;dr the electrical metering is MID certified, heat metering not so much.

Integrating MyVaillant app with EmonCMS

[Split from Vaillant inbuilt monitoring vs MID meters] I’m monitoring a new Vaillant system (not mine), and have gone the pure software route - scraping data out of their app using the myPyllant library. Seems I can get temps for indoor, outdoor, setpoint and flow, but not return. I can also get real-time power consumption, but not heat. That’s just enough for the carnot cop formula to show something sensible. One can at least see how the heat pump is behaving. [Screenshot_20240121_101912] I…