Over 80% of new UK heat pumps are installed with a manufacturer warranty of at least 5 years
The Department for Energy Security and Net Zero (DESNZ) reported in its 2026 market analysis that the standard warranty length for new heat pump installations has risen sharply since 2023 (DESNZ, Heat Pump Market Report 2026). This figure sets the baseline expectation for any homeowner considering a heat pump purchase in 2026. The report notes that warranty terms are a key factor in consumer confidence and uptake rates.
The standard heat pump warranty in the UK is 5 to 7 years for parts and labour
The most common warranty offered by major UK manufacturers for air-source heat pumps is 5 years on parts, with an optional extension to 7 years. Labour coverage is typically limited to 1 year unless a separate insurance-backed warranty is purchased. Ground-source heat pumps often carry a longer warranty on the ground loop, but the heat pump unit itself is usually 5 to 7 years (Energy Saving Trust, “Heat Pump Warranties Explained”, 2026).
Quick numbers Typical warranty lengths by manufacturer and pump type
The table below shows standard warranty periods for the most common heat pump brands available in the UK. All figures are taken from official manufacturer UK websites and MCS Installer Standards.
| Manufacturer | Air-Source (years) | Ground-Source (years) | Labour cover (years) | Extended warranty cost (approx.) |
|---|---|---|---|---|
| Mitsubishi Electric | 5 | 5 | 1 | £150–£250/year |
| Daikin | 5 (10 with Premium installer) | 5 | 1 | £200–£300/year |
| Vaillant | 5 | 5 | 1 | £180–£250/year |
| Worcester Bosch | 5 (12 with Approved installer) | 5 | 1 | £200–£300/year |
| NIBE | 5 | 5 | 1 | £150–£200/year |
| Samsung | 5 | 5 | 1 | £180–£250/year |
| Panasonic | 5 | 5 | 1 | £150–£250/year |
Costs for extended warranties vary depending on the installer and the specific model. Always check the manufacturer’s official UK website for the latest terms. heat pump installation checklist
A heat pump warranty covers the compressor, refrigerant circuit, and control board
The standard manufacturer warranty covers the compressor, heat exchanger, expansion valve, refrigerant circuit, and main control board against manufacturing defects. It does NOT cover installation errors, blocked filters, incorrect refrigerant charge, or damage from power surges (MCS Installation Standard MIS 3005, Section 9.2, 2026 update). Routine maintenance, such as cleaning filters and checking refrigerant levels, is the homeowner’s responsibility and is required to keep the warranty valid.
To keep your warranty valid, you must use an MCS-certified installer and register the product within 30 days
All major UK heat pump manufacturers require the installer to be MCS-certified (Microgeneration Certification Scheme) for the warranty to be honoured. Homeowners must register the product with the manufacturer online or via the installer within 30 days of installation, or the warranty period may be reduced or voided. Failure to schedule an annual service as per the manufacturer’s schedule can also invalidate the warranty (MCS website, “Warranty Conditions”, 2026; also manufacturer terms for Vaillant and Daikin).
Eligibility for extended and transferable warranties depends on the installer and property type
Extended warranties, such as 10 years from Daikin or 12 years from Worcester Bosch, are typically only available if the installation is carried out by a “Premium” or “Approved” installer, which is a higher tier of MCS certification. The warranty is usually transferable to a new homeowner if the property is sold within the warranty period, but only if the new owner registers the transfer within 28 days (Daikin UK warranty terms, 2026; Worcester Bosch “Greenstar” heat pump warranty leaflet). Properties with non-standard heating systems, such as underfloor heating only or very large floor areas, may have reduced warranty coverage unless a specific survey is done.
How to verify an installer’s certification and confirm your warranty is valid
Check the MCS Installer Database at mcscertified.com to confirm the installer is currently MCS-certified and listed for the specific heat pump brand you are buying. Ask for a copy of the manufacturer’s warranty certificate at the point of sale, not just a verbal promise. Verify that the installer holds TrustMark or Gas Safe Register if the system includes a gas boiler backup, as this is required for the warranty to be valid on hybrid systems (MCS website, “Find an Installer”; TrustMark website, “Warranty Conditions”, 2026). gas safe register for hybrid systems
What happens if your heat pump fails outside the manufacturer warranty period
If the unit fails after the manufacturer warranty expires, the homeowner is responsible for repair costs. These can range from £200 for a control board replacement to over £1,500 for a compressor replacement (Energy Saving Trust, “Heat Pump Repair Costs”, 2026). Some manufacturers, such as Mitsubishi Electric, offer a paid extended warranty plan after the initial period, typically costing £150 to £300 per year. Home insurance policies rarely cover heat pump breakdowns unless the damage is caused by a specific event such as a lightning strike or flood. Check your policy wording (Association of British Insurers, “Heat Pump Cover”, 2026). home insurance heat pump cover
Frequently Asked Questions
The standard heat pump warranty in the UK is 5 to 7 years for parts and labour, with most manufacturers offering 5 years on parts and 1 year on labour (Energy Saving Trust, 2026).
No, standard heat pump warranties typically cover parts only for 5 years, with labour limited to 1 year unless you purchase an insurance-backed extended warranty (MCS Installer Standards).
Worcester Bosch offers up to 12 years on air-source heat pumps when installed by an approved installer, while Daikin offers up to 10 years with a Premium installer (official UK manufacturer websites, 2026).
Extended heat pump warranty costs range from £150 to £300 per year, depending on the manufacturer and model (DESNZ, Heat Pump Market Report 2026).
Yes, the ground loop on a ground-source heat pump often carries a longer warranty period than the heat pump unit itself, typically 10-25 years (Energy Saving Trust, 2026).
