The Electrification of Heat (EoH) demonstration project is funded by the Department for Energy Security and Net Zero (DESNZ) and seeks to better understand the feasibility of a large-scale rollout of heat pumps across the UK. It aims to demonstrate that heat pumps can be installed in a wide variety of homes and deliver high customer satisfaction across a range of customer groups.

This report provides interim analysis of the heat pump performance data collected by the monitoring systems. The analysis will be refreshed, and additional analysis will be undertaken after the completion of the projects monitoring period in September 2023.

As well as the analysis, the report provides all details relating tohow the heat pumps were monitored, data was collected and interpreted. This includes:

• Detail on the physical monitoring system,
• Detail on the performance data cleansing,
• Detail on the data quality checks conducted, and how the results were interpreted,
• Detail on calculation assumptions made,
• Detail on known data quality issues and known data biases.