The heat pump monitoring datasets are a key output of the Electrification of Heat Demonstration (EoH) project, a government-funded heat pump trial assessing the feasibility of heat pumps across the UK’s diverse housing stock. These datasets are provided in both cleansed and raw form and allow analysis of the initial performance of the heat pumps installed in the trial. From the datasets, insights such as heat pump seasonal performance factor (a measure of the heat pump's efficiency), heat pump performance during the coldest day of the year, and half-hourly performance to inform peak demand can be gleaned. For the second edition (December 2024), the data were updated to include performance data collected between November 2020 and September 2023. The only documentation currently available with the study is the Excel data dictionary. Reports and other contextual information can be found on the Energy Systems Catapult website. The EoH project was funded by the Department of Business, Energy and Industrial Strategy. From 2023, it is covered by the new Department for Energy Security and Net Zero. Data availability This study comprises the raw data from the EoH project, which is only available to registered UKDS users. Only the summary data file is available via standard UKDS EUL download, due to the large size of the full raw data files. To obtain the full set of raw data, registered UKDS users should: Download the summary dataset, and then Contact the UKDS HelpDesk, quoting study number 9049, to arrange FTP access for the raw data. When unzipped, the raw data available via FTP consists of 742 CSV files. Most of the individual CSV files are too large to open in Excel. Before requesting FTP, users should ensure they have sufficient computing facilities to analyse the data. The UKDS also holds an accompanying open-access study, SN 9050 Electrification of Heat Demonstration Project: Heat Pump Performance Cleansed Data, 2020-2023. This contains the cleansed data from the EoH project, which does not require UKDS registration to access. However, since the data are similar in size to this study, only the summary dataset is available to download; an order must be placed for FTP delivery of the remaining cleansed data. Other studies in the set include SN 9209, which comprises 30-minute interval heat pump performance data, and SN 9210, which includes daily heat pump performance data.  The Python code used to cleanse the raw data and then perform the analysis is accessible via the Energy Systems Catapult Github Heat Pump Performance across the BEIS funded heat pump trial, The Electrification of Heat (EoH) Demonstration Project.  See the documentation for data contents.