Heat Pump Warranties UK: What Each Manufacturer Covers and Requires
The same heat pump can come with two years of cover or ten, depending on who installs it, whether it is registered on time and whether it is serviced every year. Here is how the main brands compare, what warranties do not cover and what to check before you choose an installer.
- Manufacturer terms checked 23 October 2026
- MCS and consumer code rules
- Independent research
Quick answer: how long is a heat pump warranty?
Compare the brandsMost manufacturers give two or three years as standard, extended to between five and ten years if the conditions are met. The extension usually depends on three things: the installer’s accreditation with that brand, registering the heat pump on time, and having it serviced every year.
Register on time
Deadlines are often as short as 30 days. Missing them can cut cover to 12 months or the standard two years.
Service every year
Most manufacturers make an annual service a condition of their warranty and can ask for proof before approving a claim.
Check the installer
The longest cover is often only available when an installer accredited by that brand supplies and fits the heat pump.
You should also get a separate workmanship guarantee. The manufacturer’s warranty covers faults with the equipment. Your installer’s guarantee covers the installation itself, and for MCS-certified domestic installations it must be insurance-backed. More on that below.
Heat pump warranties compared by manufacturer
Taken from each manufacturer’s own UK warranty pages and terms, checked on 23 October 2026. Terms change, so always ask your installer for the warranty document that applies to your heat pump.
| Manufacturer | Standard cover | Longest cover and what it takes | Registration | Annual service |
|---|---|---|---|---|
| Daikin | 2 years | 5 years free when the installer registers the heat pump on Daikin’s Stand By Me scheme; up to 7 years (last 2 years paid) with a Daikin Sustainable Home Expert installer | Through Stand By Me; activate within 2 years of commissioning | Required; Daikin may ask for proof |
| Mitsubishi Electric (Ecodan) | 3 years with a standard account installer | 5 years with an Accredited Installer; 7 years with a Business Solutions Partner. Cylinders and interface equipment stay at 3 years | Homeowner page says within 3 months of commissioning; installer terms say 30 days. Unregistered: 12 months | Required within 12 months of commissioning, then yearly, by an approved installer, a qualified provider or Mitsubishi |
| Vaillant (aroTHERM) | 2 years | 5, 7 or 10 years through a paid Cover & Care package (£295–£312 a year, including annual services); heat pump must be under 18 months old | Within 30 days of installation | Required by Vaillant or another competent engineer |
| Viessmann (Vitocal) | 2 years from delivery | Chargeable extensions if the installer registers the installation within 30 days | By the installer, within 30 days | Required within a year of installation, then yearly, recorded in the logbook |
| Panasonic (Aquarea) | Not stated on Panasonic UK’s warranty page | 7 years parts and labour when an Aquarea PRO Partner supplies and installs it | Submitted online by the installer after commissioning | Not stated on that page; check the full terms |
| Grant (Aerona³) | Not stated in Grant’s announcement | 7 years when fitted and registered by a Grant G1 accredited installer | Through the G1 scheme | Not stated in the announcement; check the full terms |
| Octopus (Cosy, Octopus-installed) | 8-year product warranty; 2 years workmanship | Workmanship extended to 8 years with a Cosy Care plan (£12 a month, including the annual service) | Handled by Octopus as the installer | Octopus says a service is not needed to keep the warranty valid if remote data shows no faults |
Check before you rely on these figures. Some manufacturers publish their full terms only as separate documents or on request, and a few of their own pages contradict each other. Mitsubishi Electric gives two different registration deadlines, so register within 30 days to be safe. We could not find current homeowner warranty terms on Samsung UK’s website, so Samsung is not included; ask the installer for the written terms. Prices for Vaillant and Octopus plans are the published rates and may rise.
Choosing between brands? Our best air source heat pumps guide and Daikin vs Mitsubishi comparison cover performance and features alongside warranty.
Still deciding on a heat pump? Ask each installer which brands they are accredited for, how long the warranty will be on your installation and what workmanship guarantee they give.
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Why the installer can change your warranty
With several brands, the same heat pump gets a longer warranty when it is fitted by an installer the manufacturer has trained and accredited.
Example: Mitsubishi Electric Ecodan
An Ecodan heat pump carries 3 years of cover with a standard account installer, 5 years with an Accredited Installer and 7 years with a Business Solutions Partner. Mitsubishi’s terms say the longer cover depends on the installer keeping that status for the whole warranty period, or it reverts to 3 years.
What this means when comparing quotes
Two quotes for the same model can carry different warranties. Ask each installer to state the warranty length in writing on the quote, and which scheme or accreditation it depends on.
Our guide to the heat pump installation process explains what should happen at commissioning, including handover of your warranty paperwork.
Manufacturer warranty, workmanship guarantee and insurance-backed guarantee
A typical installation comes with three layers of protection. They cover different things.
Manufacturer warranty
Covers faults in the heat pump itself, such as a failed compressor or circuit board. Some include a fixed labour allowance for the repair. This is the warranty compared in the table above.
Workmanship guarantee
Your installer’s promise to put right faults caused by the installation, such as leaks or wiring errors. For MCS-certified domestic installations it must last at least two years and transfer to a new owner if you sell.
Insurance-backed guarantee
Insures the workmanship guarantee if your installer stops trading. MCS requires one for domestic installations, and the policy should match the installer’s guarantee period, up to 10 years.
Make sure you actually receive the policy. MCS says an insurance-backed guarantee is only valid once the premium has been paid and the policy has been issued to you. Ask for it at handover.
Your rights under consumer law also apply on top of any warranty. If something goes wrong, raise it with the installer first.
What heat pump warranties usually do not cover
Exclusions vary by brand. Mitsubishi Electric’s Ecodan terms are a useful example of what is typically left out.
Common exclusions
- Faults caused by poor installation, incorrect electrical connections or problems with your electricity supply. These fall to the installer’s workmanship guarantee.
- Failures caused by missing or inadequate maintenance.
- Accidental damage, misuse, unapproved modifications and repairs by unauthorised engineers.
- Parts that wear out normally, such as fuses.
- Travel, out-of-hours work and access equipment such as scaffolding.
- The cost of the annual service itself.
Claim deadlines matter too. Mitsubishi’s terms, for example, exclude claims made more than seven days after a failure. Report faults to your installer straight away.
What to do if your installer stops trading
The manufacturer’s warranty on the equipment continues. For installation faults, the consumer code RECC suggests these steps.
Check the company’s status
Search Companies House to see whether the business is in liquidation, in administration or dissolved.
Claim on the insurance
If you have a valid insurance-backed guarantee, contact the insurer named on the policy. It should arrange an inspection and repairs.
Check how you paid
If you paid by credit card or a finance agreement, the card or finance provider may share liability under Section 75 of the Consumer Credit Act.
RECC advises against calling in another installer while the original company is still trading, unless it refuses to help and you have no insurance-backed guarantee, because this could affect your cover.
Your first 30 days: protect your heat pump warranty
- Confirm the heat pump is registered. Ask your installer whether they have done it, and get the confirmation. If it is your job, do it within 30 days.
- Keep the key documents together: MCS certificate, commissioning record, manufacturer warranty confirmation, workmanship guarantee and insurance-backed guarantee policy.
- Note the serial number and installation date. You will need them to register and to make any claim.
- Book the first service. Put a reminder in your calendar for 11 months after installation, so the service falls within the first year.
- Keep every service record. Manufacturers can ask for proof of annual servicing before approving a claim.
For what an annual service involves and what it costs, see our heat pump servicing and maintenance guide.
Warranty questions to ask before choosing an installer
Put these to every installer
- How long will the manufacturer’s warranty be on my installation, and what does it depend on?
- Are you accredited by this manufacturer, and at what level?
- Who registers the heat pump, and when will I get confirmation?
- How long is your workmanship guarantee, and who provides the insurance-backed guarantee?
- Do you offer servicing, and how much is an annual service after the first year?
- Does the warranty cover labour as well as parts?
Our 15 questions to ask when comparing heat pump quotes covers the rest of the quote.
Heat pump warranty FAQs
Does missing a heat pump service void the warranty?
With most manufacturers it can. Daikin, Mitsubishi Electric, Vaillant and Viessmann all make annual servicing a condition of their warranty. Octopus is an exception for its own Cosy heat pumps, saying a service is not needed to keep the warranty valid if its remote monitoring shows no faults.
Who can service my heat pump without affecting the warranty?
It depends on the brand. Mitsubishi Electric accepts its approved installers, a suitably qualified maintenance provider or Mitsubishi itself. Vaillant accepts Vaillant or another competent engineer. Octopus requires its own engineers for Cosy Care plans. Check your warranty terms before booking.
What happens if I forget to register my heat pump?
Cover usually drops to the basic level. Mitsubishi Electric limits an unregistered Ecodan to 12 months, and Viessmann falls back to its standard two years. Ask your installer straight away whether it has been registered.
Does a heat pump warranty transfer if I sell my house?
Your installer’s MCS workmanship guarantee must transfer to a new owner. Manufacturer warranties vary, so check the terms and pass the paperwork and service records to the buyer.
Is a longer warranty worth paying for?
It can be, but compare what you pay over the full term with the annual services you would pay for anyway. Vaillant’s Cover & Care packages, for example, include the annual services and repairs in the yearly fee. Check what happens to the price after the first year.
Sources and further reading
All sources checked on 23 October 2026.
- Daikin UK: Warranty
- Mitsubishi Electric: Register your Ecodan guarantee
- Mitsubishi Electric: Ecodan warranty terms and conditions
- Vaillant: Guarantee registration
- Vaillant: Heat pump Cover & Care packages
- Viessmann UK: Warranty
- Panasonic UK: 7-year Aquarea warranty
- Grant UK: 7-year guarantees through the G1 installer scheme
- Octopus Energy: Cosy Care plans
- MCS: Insurance-backed guarantees
- RECC: Faulty or underperforming system FAQs