# About to get Heat Pump installed next week!

**URL:** <https://community.openenergymonitor.org/t/about-to-get-heat-pump-installed-next-week/26834>\
**Category:** Sustainable Energy\
**Tags:** heatpumps\
**Created:** [3 October 2024 10:54 UTC](https://community.openenergymonitor.org/t/about-to-get-heat-pump-installed-next-week/26834 "2024-10-03T10:54:51Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![Andre\_K](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/andre_k/32/28208_2.png) [@Andre\_K](https://community.openenergymonitor.org/u/Andre_K)\
**Post date:** [3 October 2024 14:05 UTC](https://community.openenergymonitor.org/t/about-to-get-heat-pump-installed-next-week/26834/2 "2024-10-03T14:05:26Z")

</div>

> [@njh](#):
>
> If I wanted to participate on HeatPumpMonitor, do I need to buy a heat meter?  
> Can I get data out of the aroTHERM via ebus instead? Is that significantly less accurate?

Hi Nicholas! You can get all relevant data via ebus, however the temperature sensors on Vaillant units can be problematic, which can lead to significant errors. See the thread here:

> [@Vaillant inbuilt monitoring vs MID meters](https://community.openenergymonitor.org/t/vaillant-inbuilt-monitoring-vs-mid-meters/24230):
>
> Following on from Adam’s HeatGeek video [https://www.youtube.com/watch?v=RlcvncWvNUQ](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](https://energy-stats.uk/how-to-measure-vaillant-arotherm-cop/) Dec…

Electricity metering on the Vaillant units is highly accurate, so this only impacts heat measurements. I also have an arotherm 10 kW unit and am running a “hybrid” monitoring where I combine ebus measurements with my own temperature readings.

Depending on your technical skill level and - maybe more importantly - willingness to invest time, an independent heat meter would be the best option.

---

_[View the full topic](https://community.openenergymonitor.org/t/about-to-get-heat-pump-installed-next-week/26834)._