The Boiler Upgrade Scheme (BUS) is a UK Government initiative that’s designed to support the UK’s transition to greener, cleaner heating measures. It aims to reduce the cost of low-carbon heating technologies, making it more accessible and affordable for homeowners, and more viable for installers to support.
This is achieved through upfront grants and dedicated government funding, designed to support the installation of home energy heating sources like heat pumps and biomass boilers. The grants are available to homeowners and small business properties in England and Wales, with separate streams available for Scotland and Northern Ireland.
Boiler Upgrade Scheme Funding Statistics (July 2026)
Ofgem, in conjunction with The Department for Energy Security & Net Zero (DESNZ), releases monthly statistics on the number of applications received, the number of vouchers issued, and how much funding has been issued through those vouchers.
The BUS process has two main stages:
Stage 1 – Voucher application: Installers submit a voucher application on behalf of the homeowner. Ofgem issues a voucher if the application is successful.
Stage 2 – Voucher redemption: After an installation is commissioned, the installer submits a voucher redemption application, and Ofgem makes a grant payment once the application is successful.
These statistics have been published regularly since May 2022 and show how investment and installations have increased year on year. Here’s a summary of the last year of data (August 2025 to July 2026):
| Quarter | Total Voucher Applications | Total Vouchers Issued | Redemption Applications Received | Redemptions Paid Out | Estimated Value of Redemptions Paid Out* |
| August 2025 – October 2025 | 11,512 | 10,077 | 8,247 | 7,971 | £59,737,500 |
| November 2025 – January 2026 | 11,278 | 9,580 | 7,620 | 7,734 | £57,930,000 |
| February 2026 – April 2026 | 12,555 | 10,191 | 7,417 | 7,499 | £56,187,500 |
| May 2026 – July 2026 | 17,073 | 11,006 | 7,754 | 7,506 | £56,255,000 |
| August 2025 – July 2026 | 52,418 | 40,854 | 31,038 | 30,710 | £230,110,000 |
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table M1.1)
Here’s how those figures have changed over the course of the Boiler Upgrade Scheme (BUS). We’ll look at the same period from 2022-23, right through to the most recent statistics for 2025 into 2026.
| Year Period | Total Voucher Applications | Total Vouchers Issued | Redemption Applications Received | Redemptions Paid Out | Estimated Value of Redemptions Paid Out* |
| Aug 2022 – July 2023 | 17,071 | 15,821 | 12,993 | 12,797 | £64,348,000 |
| August 2023 – July 2024** | 27,544 | 24,410 | 17,187 | 16,535 | £118,911,000 |
| August 2024 – July 2025 | 42,250 | 36,794 | 29,006 | 29,168 | £218,547,500 |
| August 2025 – July 2026 | 52,303 | 40,756 | 31,038 | 30,710 | £230,110,000 |
| Totals to July 2026 | 139,168 | 117,781 | 90,224 | 89,210 | £631,916,500 |
** Grant amounts increased in October 2023 (from £5,000 to £7,500 for air-to-water heat pumps, and £6,000 to £7,500 for ground source heat pumps), so the new amounts have been applied to this data from October onwards.
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table M1.1)
These are routinely updated with every data release from the BUS, and show us how the Scheme is gradually approaching the Government’s target of 450,000 heat pump installations completed by 2030.
BUS Installation & Replacement Statistics (July 2026)
As part of the data on the Boiler Upgrade Scheme, there’s also information on the types of heating sources being replaced, and what installations they’ve been replaced by.
Here’s a snapshot of the data on which heating sources have been displaced, covering 2022 to 2026.
| Year Period | Gas | Oil | No Heating | Electric | Liquefied Petroleum Gas (LPG) | Coal | Other Sources* | Total Displaced |
| 2022 – 2023 | 4,613 | 2,282 | 1,567 | 885 | 361 | 137 | 107 | 9,952 |
| 2023 – 2024 | 6,605 | 2,517 | 2,642 | 1,395 | 388 | 164 | 120 | 13,831 |
| 2024 – 2025 | 14,540 | 4,075 | 3,204 | 2,200 | 712 | 268 | 206 | 25,205 |
| 2025 – 2026 | 18,396 | 4,867 | 3,389 | 2,976 | 869 | 331 | 244 | 31,072 |
| Totals to July 2026 | 44,154 | 13,741 | 10,802 | 7,456 | 2,330 | 900 | 677 | 80,060 |
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table M1.1)
Here’s how that data compares to the heating sources that have been installed as part of the Boiler Upgrade Scheme (BUS).
We’ve only included the sources that have funding available (air-to-water heat pumps, ground source heat pumps, shared ground loop, and biomass boilers), alongside the recently added air-to-air heat pumps.
| Year Period | Air-to-Water | Air-to-Air* | Ground Source | Shared Ground Loop | Biomass Boiler | Total Installations |
| 2022 – 2023 | 9,591 | 0 | 240 | 9 | 112 | 9,952 |
| 2023 – 2024 | 13,294 | 0 | 428 | 9 | 100 | 13,831 |
| 2024 – 2025 | 24,649 | 0 | 454 | 6 | 96 | 25,205 |
| 2025 – 2026 | 30,605 | 0 | 369 | 12 | 86 | 31,072 |
| Totals to July 2026 | 78,319 | 0 | 1,491 | 36 | 394 | 80,060 |
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table A1.2)
As new technologies become more widespread (as we’re starting to see with air-to-air heat pumps), it’s expected that these figures will increase and shift. A good example of this is the increase we’re seeing in Shared Ground Loop technology, where installations in 2025/26 were double what we saw in 2024/25.
Installations Broken Down by Location
Different regions see different amounts of installations, depending on population size, the availability of technology, and the number of installers based in that area. Here’s a look at which areas of England and Wales saw the most grants redeemed (Redemptions Paid) under the Boiler Upgrade Scheme since May 2022
| Location | Air-to-Water Heat Pumps | Air-to-Air Heat Pumps | Ground Source Heat Pumps | Shared Ground Loops | Biomass Boilers | Total Installations* |
| South East | 17,667 | 0 | 284 | 3 | 12 | 17,966 |
| South West | 15,474 | 0 | 460 | 21 | 107 | 16,062 |
| East | 12,082 | 0 | 146 | 1 | 18 | 12,247 |
| East Midlands | 8,631 | 0 | 116 | 3 | 13 | 8,763 |
| Yorkshire | 8,152 | 0 | 141 | 0 | 7 | 8,300 |
| North West | 7,298 | 0 | 115 | 0 | 37 | 7,450 |
| West Midlands | 6,578 | 0 | 116 | 7 | 25 | 6,726 |
| London | 5,036 | 0 | 35 | 0 | 0 | 5,071 |
| Wales | 4,433 | 0 | 121 | 2 | 166 | 4,722 |
| North East | 2,741 | 0 | 33 | 0 | 34 | 2,808 |
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table 1.2A)
The data from Ofgem also shows us which constituencies across the UK have received the most grants. Here’s a look at the top 10 areas with the most grants paid out (Redemptions Paid) for heat pump technologies since the scheme began in May 2022.
- St. Ives, Cornwall – 732 heat pumps[MI1]
- South Cambridgeshire – 688 heat pumps
- Truro & Falmouth, Cornwall – 589 heat pumps
- North Cornwall – 563 heat pumps
- Camborne & Redruth, Cornwall – 547 heat pumps
- North Devon – 520 heat pumps
- Westmorland & Lonsdale, Cumbria – 492 heat pumps
- Henley & Thame, Oxfordshire – 485 heat pumps
- St Neots & Mid Cambridgeshire – 481 heat pumps
- South Devon – 455 heat pumps
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table Q1.3)
Here are the 10 areas with the most Redemptions Paid for biomass boilers since May 2022.
- Carmarthen – 44 biomass boilers
- Ceredigion Preseli, West Wales – 28 biomass boilers
- Brecon, Radnor & Cwm Tawe – 28 biomass boilers
- Hexham, Northumberland – 21 biomass boilers
- North Cornwall – 15 biomass boilers
- Mid & South Pembrokeshire – 14 biomass boilers
- Westmorland & Lonsdale, Cumbria – 12 biomass boilers
- Central Devon – 12 biomass boilers
- Torridge & Tavistock, Devon – 11 biomass boilers
- Bangor & Aberconwy, North Wales – 10 biomass boilers
Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table Q1.3)
These statistics will change as new measures are added (like air-to-air heat pumps) and grant funding increases (as it did in October 2023).
What Does the Data Tell Us About the Boiler Upgrade Scheme?
Since starting in May 2022, the Boiler Upgrade Scheme (BUS) has only grown in popularity. Installations of air-to-water heat pumps (the most popular option) under the Scheme have increased by 219% compared with the figures for 2022/23. There are a few different reasons for that:
- An increase in government funding (in October 2023)
- Greater availability and affordability of technology
- Innovations for safer and more consistent installation processes
Air-to-water heat pumps have continued to be the dominant technology in place, accounting for 97.6% (78,139) of all installations since May 2022[1]. The next most popular (ground source heat pumps) saw 1,527 installations across both single property heat pumps and shared loops[2].
Since the start of the Scheme, we’ve seen rises in the number of both voucher applications and vouchers issued (up by 206% and 157%,respectively), alongside a rise of 139% in redemption applications and a similar 140% increase in successful redemptions[3].
These statistics point towards more homeowners taking advantage of the grants available, and a better understanding of how installers can complete the application process on behalf of the customers.
On a wider scale, data like this adds weight to future changes and to increasing funding available through similar initiatives like the Warm Homes Fund.
[1] Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table 1.1)
[2] Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table 1.1)
[3] Data Source: Boiler Upgrade Scheme statistics: July 2026 – GOV.UK (Table M1.1)