HeatPumpSwitch › Community

Real bills and measured SCOPs, submitted by owners

Manufacturers publish laboratory SCOPs. Installers publish design intentions. Nobody publishes what heat pumps actually consume in real houses, because nobody has an incentive to. This is an attempt to build that dataset in public.

This dataset is empty on day one, and saying so is more useful than faking rows. The form below is wired to nothing until you connect it to your own endpoint — see README.md.

What measured performance actually looks like

Before any of our readers submit a single figure, here is what the published studies already show. This is the benchmark your own numbers will be compared against — and the reason we treat a datasheet SCOP of 4.2 as marketing rather than data.

Study	Publisher	Sample	Metric	Value	Year
Electrification of Heat Demonstration Project The first large UK dataset of in-use performance across a deliberately broad spread of housing types, including houses that would normally be called unsuitable.	Energy Systems Catapult / DESNZ	427 air source heat pump installations	mean SPF	2.8	2021
MCS-installed heat pumps, 2025/26 The median has moved up by roughly 10 % against earlier benchmarks. Installation practice is improving; the physics has not changed.	Energy Systems Catapult	MCS-certified installations	median SCOP	3.0	2026
Reported in-use range across UK studies Against manufacturer COP claims of 4.0–5.0 measured in test conditions. The gap is the single most under-communicated fact in the market.	multiple	aggregate of published field studies	typical range	2.5 – 3.5	2026
In-situ heat pump performance analysis of Ofgem data 2017–2022 Uses metered RHI payment data rather than a demonstration project, so it covers ordinary commercial installations over five years.	Ground Source Heat Pump Association	Domestic RHI metered installations	analysis of metered in-situ performance	—	2024

Why field figures sit below datasheet figures. SPF (seasonal performance factor) measured in real houses is not the same quantity as a datasheet SCOP. The most rigorous studies measure to the SEPEMO H4 boundary, which includes the outdoor unit, backup and immersion heaters, and circulation pumps — everything the meter sees. Datasheet SCOP excludes most of that and is measured at a fixed flow temperature in a laboratory. Expect field figures to sit below datasheet figures for that reason alone, before any question of installation quality.

The dataset that already does this properly

HeatpumpMonitor.org

OpenEnergyMonitor community

A public dashboard of individual heat pump systems sharing measured performance, using MID-approved Class 1 electricity and Class 2 heat metering to the SEPEMO H4 boundary. Per-system pages with annual SPF, and an analysis of SPF against design flow temperature — the relationship this whole site is built around.

Why this does not exist anywhere else

Every party in the market has a reason not to publish in-use performance. A few hundred structured records — house type, year, system, measured annual kWh — would be the only open dataset of its kind in Europe. It is also the sort of first-hand, verifiable information that is worth more than another restatement of a manufacturer's brochure.

Submit your own numbers

How submissions are handled

We publish the structured fields only: house type, era, system type, output, emitters, design flow temperature if you know it, annual electricity for heating, and whether hot water is included.
We do not publish your address, your name or free text. Reviews of named installers are limited to structured yes/no and price-versus-quote fields — we do not host free-text reviews of named companies.
Your email is used to verify the submission and nothing else. It is not passed to any advertiser.
Every record shows the month it was submitted, so stale data ages visibly rather than silently.