Research and analysis

Evaluation of the Boiler Upgrade Scheme, 2025

The second set of interim findings from the evaluation of the Boiler Upgrade Scheme and accompanying survey data tables.

• From: Department for Energy Security and Net Zero
• Published: 21 January 2026

Applies to England and Wales

Documents

Evaluation of the Boiler Upgrade Scheme: 2025 interim report

Ref: RAF052/2223

PDF, 997 KB, 71 pages

Evaluation of the Boiler Upgrade Scheme: 2025 interim technical methodological report

Ref: RAF052/2223

PDF, 921 KB, 99 pages

Boiler Upgrade Scheme evaluation: Installer survey data tables, Wave 2 (Excel)

MS Excel Spreadsheet, 360 KB

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Boiler Upgrade Scheme evaluation: Installer survey data tables, Wave 2 (alternative format ODS file)

ODS, 139 KB

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Boiler Upgrade Scheme evaluation: Property owner survey data tables Wave 2 (Excel)

MS Excel Spreadsheet, 1.05 MB

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Boiler Upgrade Scheme evaluation: Property owner survey data tables Wave 2 (alternative format ODS file)

ODS, 439 KB

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Boiler Upgrade Scheme evaluation: Property owner survey data tables Wave 3 (Excel)

MS Excel Spreadsheet, 1.14 MB

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Boiler Upgrade Scheme evaluation: Property owner survey data tables Wave 3 (alternative format ODS file)

ODS, 488 KB

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Boiler Upgrade Scheme evaluation: Follow-up property owner survey data tables (Excel)

MS Excel Spreadsheet, 820 KB

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Boiler Upgrade Scheme evaluation: Follow-up property owner survey data tables (alternative format)

ODS, 297 KB

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Details

The Boiler Upgrade Scheme (BUS) supports the decarbonisation of heating in domestic properties by incentivising the deployment of low carbon heating (LCH) systems. The original duration of the BUS (2022 to 2025) is subject to an evaluation.

These reports and data tables provide interim evaluation findings, based on research conducted after the heat pump grant uplift with property owners who had a low carbon heating system installed, as well as research with registered installers.

Topics covered in these outputs include:

• property owners’ experiences of participating in the BUS
• property owners’ satisfaction with their LCH systems after one heating season
• whether property owners experienced changes in bills and energy tariffs
• the impact of the grant uplift on property owners’ decision to install an LCH system
• installers’ experiences of participating in the BUS
• why some property owners and installers did not participate in, or dropped out of, the Scheme

This is the second publication of the BUS evaluation:

• the first report was published earlier in 2025
• a final synthesis report will follow in 2026

Published 21 January 2026