Page review status
Written by: HeatWise Home Editorial Team
Reviewed by: Editorial review by HeatWise Home
Review status: Internally reviewed for clarity, source consistency, and calculation assumptions.
Expert review: Not currently externally expert-reviewed.
Last updated: 2026-04-28
Last reviewed: 2026-04-28
Confidence: medium
External expert review: HeatWise Home does not currently publish named external expert reviewers. We are working toward adding independent review from qualified retrofit, heating, or building-energy professionals. Until then, users should treat our calculators and guides as educational planning tools and confirm decisions with official sources and qualified installers.
Medium confidence
Energy prices, grant rules, and installation costs change frequently. The figures on this page are planning ranges, not quotes. Always confirm your current tariff, delivered fuel price, installer scope, and eligibility in the named references linked below.
Current BUS grant values (planning view, checked 2026-04-28)
Grant values should be verified directly against GOV.UK and Ofgem before quote acceptance.
The estimator below is for planning scenarios only.
| Technology | Grant value | Planning note |
|---|
| Air-to-water heat pump | £7,500 | Installer-led BUS application |
| Ground source heat pump | £7,500 | Includes eligible water source systems |
| Air-to-air heat pump | £2,500 | Listed in current GOV.UK BUS guidance |
| Biomass boiler | £5,000 | Additional eligibility restrictions apply |
Inputs this estimator asks you to confirm
1) Property location (England or Wales) and ownership type.
2) Existing heating system being replaced (fossil fuel or electric baseline).
3) Proposed technology (air-to-water, ground source, air-to-air, biomass where eligible).
4) Installer status (MCS-certified and able to submit BUS applications).
5) Whether homeowner consent and timing requirements can be completed on schedule.
Installer-led process and homeowner consent
BUS is installer-led. The installer applies through Ofgem and the property owner confirms consent before voucher issue.
This page does not replicate official approval logic. It is designed to help homeowners ask better quote and eligibility questions.
Quote deduction and cash-flow planning
In standard BUS flow, the grant is deducted from your quote/invoice upfront, and the installer redeems the voucher afterward.
Use the net-of-grant quote in your payback and affordability checks, then compare with scenarios where eligibility fails or timing is missed.
Recommended next steps
Confirm current GOV.UK and Ofgem eligibility wording for your property and technology.
Ask installers to show MCS credentials and BUS application experience in writing.
Use the UK heat pump cost calculator and calculator methodology page to test low/medium/high scenarios before signing.
Disclaimer
This Boiler Upgrade Scheme Calculator is an independent educational estimator and is not operated by GOV.UK, Ofgem, or MCS.
It does not grant approval, reserve vouchers, or guarantee eligibility. Homeowners must verify all rules and timelines with official sources and qualified installers.
Sources and assumptions
Last checked: 2026-04-28. Confidence: medium.
- Electricity price range: GBP 0.22-0.34 per kWh (Ofgem regional cap spread and available tariffs).
- Gas price range: GBP 0.05-0.11 per kWh (Ofgem cap benchmark and regional/tariff variation).
- Heating oil equivalent range: GBP 0.09-0.13 per kWh equivalent (kerosene supplier tracking, delivery-size and season dependent).
- GOV.UK Boiler Upgrade Scheme
Used for: Grant rules and eligibility checks
- Ofgem energy price cap and market data
Used for: Energy price and market context
- MCS standards and UK building fabric guidance
Used for: Efficiency, retrofit, and installer standards
Caveat: prices vary by supplier, tariff, region, standing charge, and usage. Use your live bill and tariff for final decisions.
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Privacy and referral transparency
- There is no obligation to proceed after you submit this form.
- We do not routinely share your details with third parties.
- Partner introductions only happen where relevant to your request.
- Your data is handled according to our Privacy Policy.
What happens next:
- We review your question or quote request.
- We may reply directly or ask for missing details.
- If a partner introduction is relevant, we explain who the partner is before sharing your details.
- You are under no obligation.
- Your data is handled according to our Privacy Policy.
If we suggest a partner
Where we suggest a partner, we aim to prioritise relevant, reputable providers or installers. We do not recommend proceeding without checking credentials, quotes, warranties, and official grant requirements.