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Octopus Cosy Heat Pump: Performance Dashboard

30-day averages: 2 Feb ‐ 3 Mar 2026

Last 30 days average COP

3.96 +0.36

Last 90 days average COP

3.87

Last year average SPF

3.94

Cosy heat pump versus gas boiler

Boiler Beater

To run a heat pump for less than a gas boiler, you need an SPF of >3.3 on Cosy Octopus, or >3.9 on Flexible SVT.

Median Coefficient of Performance (COP) by External Temperature

Median COP 2.5 3 3.5 4 4.5 Average External Temperature -5 0 5 10 15 20
<1% of Heating Season<0°Coldest Days
3-8% of Heating Season0°-5°Early and Late Winter
34-50% of Heating Season5°-12°Early and Late Winter
38-49% of Heating Season12°-15.5°Shoulder Seasons
Hot Water Only(Not part of heating season)
Median COP
Average SPF

Definitions

COP

The ratio of heat output to electricity input at a specific moment under specific conditions. e.g. 3.5 units of heat for every 1 unit of electricity.

SPF

The Seasonal Performance Factor over the time period, defined as heat produced (power out) divided by electricity consumed (power in). This is a real-world measure of performance—the long-term COP across all temperatures and running conditions. SPF differs from SCOP (a term often used in relation to heat pump performance), which is an estimate of performance based on a set of fixed conditions in a lab. Instead, SPF reflects the actual, long-term performance of the system in a specific home.

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