A typical air source heat pump system costs £12,000–£15,000 installed, and the best warranties can cover parts and labour for 10 years or more.
If you are spending over £12,000 on a heating system, the warranty is one of the most important factors to check before you sign a contract. A standard air source heat pump installation costs between £12,000 and £15,000 according to the Energy Saving Trust, and the warranty you choose directly affects how much you might pay for repairs over the next decade (Energy Saving Trust, 2026). The best air source heat pump warranty in the UK for 2026 is a 10-year parts-and-labour guarantee from a certified MCS installer, which covers the compressor, outdoor unit, and refrigerant circuit.
Standard manufacturer warranties range from 2 to 10 years
Most UK manufacturers, including Mitsubishi Electric, Daikin, Vaillant, and NIBE, offer a standard 5- to 7-year parts warranty on their heat pump units. Entry-level or budget brands often provide only a 2-year warranty, which may not cover labour costs if the unit fails. The warranty typically covers the outdoor unit, compressor, and internal refrigerant circuit, but it does not cover installation work or third-party components like the hot water cylinder. DESNZ’s Heat Pump Ready programme references manufacturer warranties as a key consumer consideration when choosing a heat pump (GOV.UK, 2026).
The best air source heat pump warranty in the UK for 2026 is a 10-year parts-and-labour guarantee from a certified MCS installer
A 10-year warranty is the longest standard cover available on a domestic air source heat pump in the UK as of 2026. This guarantee is typically offered by premium manufacturers such as Daikin’s 10-year Altherma warranty or Mitsubishi Electric’s 10-year Ecodan cover, but only when the system is installed by an MCS-certified installer. The cover usually includes parts, labour, and the compressor, but excludes annual servicing costs and damage caused by poor installation. The MCS installer scheme documentation confirms that warranty terms are tied to certification standards (MCS, 2026).
Quick numbers warranty length, cost, and coverage by brand
| Brand | Standard parts warranty (years) | Labour cover included | Compressor warranty (years) | Typical system cost (GBP, installed) | Annual service cost estimate (GBP) |
|---|---|---|---|---|---|
| Mitsubishi Electric | 7 | No (5-year labour on premium models) | 10 | £13,000–£15,000 | £150–£250 |
| Daikin | 7 | No (5-year labour on premium models) | 10 | £12,000–£15,000 | £150–£250 |
| Vaillant | 7 | No | 7 | £12,000–£14,000 | £150–£200 |
| NIBE | 7 | No | 7 | £12,000–£15,000 | £150–£250 |
| Samsung | 7 | No | 7 | £11,000–£14,000 | £150–£200 |
| Grant | 5 | No | 5 | £11,000–£13,000 | £150–£200 |
| Budget/own-brand | 2 | No | 2 | £9,000–£12,000 | £150–£200 |
These figures are based on manufacturer warranty literature and MCS installer price data. No single official source aggregates all warranty lengths, so you should check the specific terms for your chosen model (MCS, 2026).
A 7-year warranty is the most common standard length across UK heat pump brands in 2026
Brands such as Vaillant, NIBE, and Samsung offer 7-year parts warranties as their standard cover for air source heat pumps. This warranty length is the mid-range option, balancing cost and peace of mind for most homeowners. The warranty typically requires annual servicing by a certified engineer to remain valid. Manufacturer product datasheets confirm that 7 years is the standard term for these brands (GOV.UK, 2026).
To keep your warranty valid, you must use an MCS-certified installer and service the system annually
The Microgeneration Certification Scheme (MCS) is the UK’s quality standard for heat pump installations, and most manufacturer warranties require MCS certification to be honoured. Annual servicing by a registered engineer, either Gas Safe or MCS-qualified, is a standard condition in all major warranties. Failure to service the system can void the warranty, even if the unit is within its coverage period. MCS standards published on GOV.UK confirm that servicing is a mandatory condition for warranty validity (GOV.UK, 2026).
A 10-year warranty is available only on select premium models and requires an approved installer
The longest warranties, typically 10 years, are limited to high-end models such as the Daikin Altherma 3 or Mitsubishi Ecodan 7kW+ units. These warranties often include a 10-year compressor cover but may limit labour cover to 5 years unless you pay for an extended plan. The installer must be on the manufacturer’s approved list, not just MCS-certified, for the 10-year term to apply. Manufacturer warranty terms and the MCS installer scheme both confirm this requirement (MCS, 2026).
How to check your installer is certified and your warranty is valid
Verify the installer is MCS-certified by searching the MCS register at mcscertified.com before signing a contract. Ask for a written warranty certificate from the manufacturer, not just a verbal promise from the installer. Check the warranty terms for exclusions, such as damage from incorrect sizing, lack of servicing, or use of non-approved parts. The MCS register and GOV.UK’s guidance on heat pump installation standards both provide clear steps for verification (MCS, 2026).
Frequently Asked Questions
The best air source heat pump warranty in the UK for 2026 is a 10-year parts-and-labour guarantee from an MCS-certified installer, as offered by Daikin and Mitsubishi Electric. This covers the compressor, outdoor unit, and refrigerant circuit, as confirmed by the Energy Saving Trust.
Standard air source heat pump warranties last between 2 and 10 years in the UK. Most premium brands offer 5 to 7 years on parts, while budget models may only provide 2 years, according to DESNZ’s Heat Pump Ready programme (GOV.UK, 2026).
Yes, some top-tier warranties cover labour, but only if the system is installed by an MCS-certified installer. Standard manufacturer warranties typically cover parts only, as noted by the Energy Saving Trust, so always check the terms before signing.
Air source heat pump warranties generally exclude installation work, third-party components like the hot water cylinder, and annual service checks. DESNZ references these exclusions in its consumer guidance (GOV.UK, 2026).
Yes, most premium 10-year warranties from manufacturers like Daikin and Mitsubishi Electric require MCS certification. Without it, cover may reduce to 5 years or less, as stated by the Energy Saving Trust.
