A Mitsubishi Ecodan air source heat pump costs roughly 30% less to run than a typical UK gas boiler, based on 2026 energy price cap figures.
The running cost advantage is calculated using the Seasonal Coefficient of Performance (SCOP) versus a gas boiler’s efficiency, using Ofgem’s 2026 price cap unit rates for electricity and gas. A typical annual running cost for a gas boiler in a 3-bed semi is approximately £1,100 (2026 average), while an Ecodan with a SCOP of 3.5 is around £770. The comparison uses the standard Ofgem methodology for a 3-bed semi-detached home with average insulation (Ofgem, 2026).
The Ecodan's SCOP of 3.6 means for every £1 of electricity
SCOP (Seasonal Coefficient of Performance) is the standard metric for real-world heat pump efficiency across a full heating season. The Ecodan range (models like the PUZ-WM and SUZ-SWM) typically achieves a SCOP of 3.5 to 3.8, with the 8.5kW model scoring 3.6. This is independently verified by the MCS (Microgeneration Certification Scheme) product database (MCS Product Database, 2026).
You qualify for the £7,500 Boiler Upgrade Scheme grant if your property has a valid Energy Performance Certificate (EPC) with no outstanding recommendations.
The 2026 Boiler Upgrade Scheme (BUS) provides a £7,500 upfront grant towards an air source heat pump, including the Ecodan. Eligibility requires an EPC with no outstanding cavity wall or loft insulation recommendations (unless an exemption applies). The property must be in England or Wales, and the heat pump must be installed by an MCS-certified installer (GOV.UK, 2026).
Households with a gross income under £31,000 may qualify for a fully funded Ecodan through the ECO4 scheme.
ECO4 (Energy Company Obligation) provides free or heavily subsidised heat pumps to low-income and vulnerable households. Eligibility is based on qualifying benefits (e.g., Pension Credit, Income Support, Universal Credit) or a gross annual income under £31,000. The scheme covers the full cost of installation, including the Ecodan unit, for eligible properties (Ofgem, 2026).
Quick numbers running costs, grant amounts, and efficiency figures for the Mitsubishi Ecodan.
| Metric | Figure | Source |
|---|---|---|
| Typical annual running cost (gas boiler, 3-bed semi) | £1,100 | Ofgem 2026 |
| Typical annual running cost (Ecodan, 3-bed semi) | £770 | Energy Saving Trust 2026 |
| Boiler Upgrade Scheme grant | £7,500 | GOV.UK 2026 |
| ECO4 maximum household income | £31,000 | Ofgem 2026 |
| Ecodan SCOP range | 3.5–3.8 | MCS Product Database 2026 |
| Typical Ecodan unit cost (before grants) | £2,500–£4,000 | GOV.UK 2026 |
| Typical installed cost (after BUS grant) | £2,500–£4,500 | GOV.UK 2026 |
The £7,500 Boiler Upgrade Scheme grant is the primary way most UK homeowners will afford an Ecodan in 2026.
The BUS grant reduces the typical installed cost of an Ecodan from around £10,000–£12,000 to £2,500–£4,500. The grant is deducted from the invoice by your MCS-certified installer at the point of sale; you do not claim it yourself. You must not have already started the installation before applying for the grant (GOV.UK, 2026).
You must use an MCS-certified installer to qualify for any government grant or 0% VAT on your Ecodan.
MCS (Microgeneration Certification Scheme) certification is mandatory for the BUS grant, ECO4, and the 0% VAT rate on heat pumps. You can verify an installer’s MCS status on the MCS website (mcscertified.com) by searching their certificate number. Installers should also hold TrustMark registration for consumer protection (MCS, 2026).
A properly sized Ecodan will heat your home to 21°C even when outside temperatures drop to -10°C.
Mitsubishi Ecodan units are built to maintain full heating output down to -10°C to -15°C outdoor air temperature. The Ecodan’s inverter-driven compressor modulates its output to match the heating demand, avoiding on/off cycling. Correct sizing by an MCS installer (using a full heat loss calculation) is essential for this performance (BRE, 2026).
How to find an MCS-certified heat pump installer
Boiler Upgrade Scheme eligibility checklist 2026
Frequently Asked Questions
Around £770 per year for a typical 3-bed semi-detached home, based on Ofgem's 2026 energy price cap rates. This is roughly 30% less than a gas boiler's £1,100 annual running cost.
The Mitsubishi Ecodan range typically achieves a SCOP of 3.5 to 3.8, with the common 8.5kW model scoring 3.6. This is independently verified on the MCS product database.
Yes, you can get a £7,500 upfront grant through the Boiler Upgrade Scheme if your EPC has no outstanding insulation recommendations. The installer must be MCS-certified, per GOV.UK rules.
Yes, low-income households with a gross income under £31,000 or on qualifying benefits can get a fully funded Ecodan through the ECO4 scheme. Eligibility is checked by your energy supplier.
The Ecodan costs about £330 less per year to run than a gas boiler in a 3-bed semi, based on Ofgem's 2026 figures. It also produces lower carbon emissions when powered by grid electricity.
