# HeatpumpMonitor.org: Other studies and comparisons

**URL:** <https://community.openenergymonitor.org/t/heatpumpmonitor-org-other-studies-and-comparisons/23195>\
**Category:** Heatpump\
**Created:** [16 March 2023 17:13 UTC](https://community.openenergymonitor.org/t/heatpumpmonitor-org-other-studies-and-comparisons/23195 "2023-03-16T17:13:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![TrystanLea](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/trystanlea/32/31_2.png) [@TrystanLea](https://community.openenergymonitor.org/u/TrystanLea)\
**Post date:** [16 March 2023 17:13 UTC](https://community.openenergymonitor.org/t/heatpumpmonitor-org-other-studies-and-comparisons/23195/1 "2023-03-16T17:13:06Z")

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Moved from the main thread. Picking up from earlier posts on other trials:

- [Energy Saving Trust trial](https://community.openenergymonitor.org/t/introducing-heatpumpmonitor-org-a-public-dashboard-of-heat-pump-performance/21885/99)
- [RHPP Trial](https://community.openenergymonitor.org/t/introducing-heatpumpmonitor-org-a-public-dashboard-of-heat-pump-performance/21885/99)
- [Mitsubishi trial](https://community.openenergymonitor.org/t/introducing-heatpumpmonitor-org-a-public-dashboard-of-heat-pump-performance/21885/106)

A new report out today Energy Systems Catapult: [Heat Pumps 3 x More Efficient than Boilers | Energy Systems Catapult](https://es.catapult.org.uk/news/heat-pumps-shown-to-be-three-times-more-efficient-than-gas-boilers)

Looks like [heatpumpmonitor.org](http://heatpumpmonitor.org) systems are still on the upper end of the systems seen in these studies. Though interestingly there are quite a few systems with a COP of 3.5-4.0 in the scatter graph below:

Here are some of the key tables, summarising the findings:

 ![image](https://community.openenergymonitor.org/uploads/default/original/3X/d/5/d5b183c87aaf625a4537ee6f33cf2657b1221ce6.png)

### Air source heat pumps:

 ![image](https://community.openenergymonitor.org/uploads/default/original/3X/f/a/fa947cf4ea39e01b6ef85ee0f934a0a636e8c200.png)

### Refrigerants

Another interesting finding that the newer refrigerants are out performing R410a, not something we have enough data points on yet to be able to make any inference.

 ![image](https://community.openenergymonitor.org/uploads/default/original/3X/1/2/12bd0ab58be705d11464a7011db41130f5e79daf.png)

### Coldest day performance

> The observed heat pump efficiency (COP(H4)) decreased as the external temperature  
> decreased. The median COP(H4) on the coldest day (mean temperature -0.4°C) was:  
> • Median coldest day COP(H4) = 2.44; IQR = [2.20, 2.70]; n=484

### SPF H2 Scatter

There are quite a few systems here that cover the range we are seeing!

 ![image](https://community.openenergymonitor.org/uploads/default/original/3X/3/2/32958b71ba42a88a1eff82bbac808cee4f387b28.png)