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 …

The (hopefully) final episode in my epic quest for accurate measurements: I added some additional insulation around the temperature sensors. This got my compressor-off-delta down to around 0.1-0.2K. Today’s DHW run measured 6.3 kWh generated hot water inside Vaillan’s app; my own sensors yield 6.05 …

@glyn.hudson it would be great to get this running on the system that you installed! [image] Andre_K: ebusd/hmu/CurrentYieldPower - Current vaillant “Environmental yield” power ebusd/hmu/CurrentConsumedPower - Current electrical power ebusd/hmu/WaterThroughput - Water flow rate ebusd/hmu/Flo…

I unfortunately don’t know what the sensors look like and won’t currently open the outside unit to check. I will bring it up with my installer & Vaillant service and update here if anything gets fixed. In case they do open the unit I will definitely peek over their shoulder. It should be very easil…

Using ebus it’s a 0.5 degree delta for me. I did notice this and only calculate heat if delta > 1.5. It’s hard for me to compare heat generated vs when we had gas as the building has increased in size and I don’t know the efficiency of the old gas boiler. But ASHP heat is in same sort of range as p…

Flow/Return in August. Often the return is warmer than the flow ! [image]

Interesting results. 0.5 °C is better than in my >1 °C but still too much in my opinion, especially since (at least for me) the return temperature is spot on.

My installer wasn’t very helpful and I’ll launch an inquiry with Vaillant. Some more things I found: From a service manual, it appears the sensors are extrnal to the pipes (13 and 19): [grafik] Also, it appears the return temperature also slightly varies with outside temperature (higher than my …

Apparently, the electricity measurement in Vaillant HPs is MID approved: https://x.com/_heatgeek/status/1752791102850252902?s=20 The inbuilt meter is being used for the OVO Heat Pump Plus trail for billing purposes via the Vaillant Internet gateway. The heat output measuring is not MID approved, i…

Good to know at least the electricity meter is accurate. Even with my corrections above the measured temperatures seem to be dependent on outdoor temperature and whether the pump is heating or making hot water. I ordered high accuracy pipe sensors and will fit them on the pipes entering the house bu…

Following the exchange between @dfeist , @Zarch and me in the Vaillant owners Thread , here’s some comparison data: My system Roughly a 1.2K constant offset between flow & return. This massively overstates heat generated in the Vaillant stats. My own (non MID, but properly calibrated together in an…

My Sontex flow rate is under-reporting due to dirt. Once I get it cleaned during service (in a couple of weeks), I’ll upload a comparison.

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Vaillant inbuilt monitoring vs MID meters

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