The £7,500 Boiler Upgrade Scheme grant is the primary heat pump subsidy in 2026
The Boiler Upgrade Scheme (BUS) provides a flat-rate grant of £7,500 for both air-source and ground-source heat pumps, according to Ofgem’s BUS statistics for Q1 2026 (GOV.UK, 2026). This grant is available to homeowners in England and Wales who replace an existing fossil-fuel heating system, such as gas, oil, LPG, or electric storage heaters. The £7,500 is deducted from the installer’s quote at the point of sale, meaning you never receive cash directly.
Yes, heat pump grants stack: you can combine the £7,500 Boiler Upgrade Scheme (BUS) with ECO4 insulation funding in 2026. The total subsidy must not exceed the installation cost, and ECO4 often covers insulation first to meet EPC requirements.
- Stack BUS £7,500 and ECO4 funding for heat pump upgrades in 2026.
- Boiler Upgrade Scheme covers air and ground source heat pumps for homeowners.
- ECO4 funds insulation first to fix EPC recommendations before BUS application.
- Total combined subsidy must not exceed 100% of installation cost per Ofgem.
- ECO4 eligibility requires low income or vulnerability; BUS is universal in England and Wales.
- The £7,500 Boiler Upgrade Scheme grant is the primary heat pump subsidy in 2026
- ECO4 can cover insulation and heating upgrades before or alongside a heat pump installation
- The "stacking" rule allows homeowners to use BUS and ECO4 together in 2026
- Quick numbers, typical costs, grants, and payback for a stacked installation
- The direct answer to "Can I stack heat pump grants?" is yes, with a limit on total subsidy
- Eligibility for BUS requires a valid MCS-certified installer and a qualifying EPC
- How to verify an installer is certified for both BUS and ECO4 work
The BUS is capped at one grant per property, and your property must have a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation. If your EPC flags missing insulation, you must address that first, unless you hold a valid exemption such as being in a listed building (GOV.UK, 2026).
ECO4 can cover insulation and heating upgrades before or alongside a heat pump installation
The Energy Company Obligation (ECO4) scheme, administered by Ofgem, funds energy-efficiency measures for low-income and vulnerable households in England, Scotland, and Wales. ECO4 can pay for loft insulation, cavity wall insulation, solid wall insulation, and sometimes first-time central heating systems, including heat pumps, as detailed in DESNZ’s ECO4 delivery guidance (GOV.UK, 2026).
A key advantage is that homeowners can receive ECO4-funded insulation work that improves the property’s EPC rating, making them eligible for the BUS grant if they previously failed the EPC requirement. ECO4 does not provide a cash payment; instead, energy suppliers fund the work directly through approved installers, with no cost to the eligible household (Ofgem, 2026).
The “stacking” rule allows homeowners to use BUS and ECO4 together in 2026
Ofgem’s official guidance for the Boiler Upgrade Scheme, updated January 2026, states that BUS grants can be combined with ECO4 funding, provided the total government subsidy does not exceed the total cost of the heat pump installation (GOV.UK, 2026). This means you can receive the full £7,500 BUS grant for a heat pump and also have ECO4 pay for insulation or additional heating system upgrades in the same property.
The key condition is that the ECO4-funded measures must be separate from the heat pump installation itself. For example, ECO4 pays for loft insulation, and BUS pays for the heat pump. No single component, such as the heat pump unit, can be funded by both schemes; the funding must be split across distinct eligible measures (Ofgem, 2026).
Quick numbers, typical costs, grants, and payback for a stacked installation
| Scenario | Annual heating cost (gas vs. heat pump) | BUS grant amount | ECO4 funding value (average insulation package) | Total out-of-pocket cost after both grants | Annual running cost saving (gas to heat pump) | Simple payback period |
|---|---|---|---|---|---|---|
| Gas boiler replacement without grants | £1,100 (gas) vs. £850 (heat pump) | £0 | £0 | £12,000 | £250 | 48 years |
| With BUS only | £1,100 (gas) vs. £850 (heat pump) | £7,500 | £0 | £4,500 | £250 | 18 years |
| With BUS + ECO4 insulation | £1,100 (gas) vs. £850 (heat pump) | £7,500 | £3,000 | £1,500 | £250 | 6 years |
Sources: Ofgem BUS statistics Q1 2026, DESNZ “ECO4 Scheme: Annual Report 2025″, Energy Saving Trust “Heat Pump Running Costs 2026” (Energy Saving Trust, 2026). Figures assume a typical 3-bed semi-detached home, gas boiler replacement, and average insulation package value.
The direct answer to “Can I stack heat pump grants?” is yes, with a limit on total subsidy
Yes, you can stack heat pump grants in 2026, specifically the £7,500 Boiler Upgrade Scheme (BUS) grant with ECO4-funded insulation or heating measures, as long as the combined government funding does not exceed the total installation cost. The stacking is permitted under Ofgem’s “no double-funding” rule, which allows separate measures to be paid by different schemes (GOV.UK, 2026).
Homeowners must ensure the installer coordinates the BUS application and the ECO4 referral, as the two schemes use separate application portals and verification processes. The maximum practical benefit is a heat pump installed for £7,500 less (BUS) plus free insulation (ECO4), reducing the homeowner’s outlay to near zero in some low-income cases (Ofgem, 2026). How to combine BUS and ECO4 grants step-by-step
Eligibility for BUS requires a valid MCS-certified installer and a qualifying EPC
The heat pump must be installed by an MCS-certified installer, as confirmed by the MCS Register (MCS, 2026), and the installer must apply for the BUS grant on the homeowner’s behalf before installation begins. The property must have a valid EPC (issued within the last 10 years) with no outstanding recommendations for loft or cavity wall insulation, unless the homeowner has a valid exemption (e.g., property is a listed building) (GOV.UK, 2026).
For ECO4, eligibility is based on means-tested benefits (e.g., Pension Credit, Universal Credit, Child Tax Credit) or a referral from a local authority under the LA Flex route, per DESNZ’s ECO4 eligibility criteria (GOV.UK, 2026). Homeowners who do not qualify for ECO4 can still use BUS alone, but they must pay for any required insulation upgrades themselves.
How to verify an installer is certified for both BUS and ECO4 work
For BUS, the installer must be listed on the MCS Register (mcsregister.com) and hold a current MCS certificate for heat pump installation, verify by entering the installer’s name or registration number (MCS, 2026). For ECO4, the installer must be registered with TrustMark and hold the relevant PAS 2030 certification for the measures they install, as confirmed by TrustMark’s ECO4 installer list (TrustMark, 2026).
Homeowners should request written confirmation that the installer can handle both the BUS grant application (via Ofgem’s portal) and the ECO4 referral (via the energy supplier’s scheme). The installer must provide a single, transparent quote that separately itemises the BUS-funded heat pump cost and any ECO4-funded measures, with no hidden fees or cross-subsidies (Ofgem, 2026). Checklist for vetting heat pump installers
Frequently Asked Questions
Yes, you can combine the Boiler Upgrade Scheme (BUS) and ECO4 for a heat pump installation in 2026. Ofgem confirms stacking is allowed as long as the total government subsidy does not exceed the full installation cost.
The Boiler Upgrade Scheme provides a flat-rate grant of £7,500 for both air-source and ground-source heat pumps in 2026, according to Ofgem's BUS statistics (GOV.UK).
ECO4 can cover heat pump installation for eligible low-income households, but it more commonly funds insulation first. The scheme may include first-time central heating with a heat pump, as per DESNZ's ECO4 delivery guidance (GOV.UK, 2026).
The stacking rule means you can use BUS and ECO4 together for a heat pump, provided the combined subsidy does not exceed the total cost. Ofgem's updated January 2026 guidance allows this, with ECO4 often covering insulation to meet EPC requirements.
Yes, you need a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation to qualify for the BUS grant. Exemptions apply for listed buildings (GOV.UK, 2026).
