Heat pump servicing requirements and annual checks
If you own a heat pump, you may be wondering whether an annual service is actually necessary or just another industry recommendation you can skip. The short answer is that skipping it can cost you thousands in repairs and void your warranty. Fewer than half of UK heat pump owners had a service booked in the last 12 months, according to the 2025/26 DESNZ “Heat Pump Consumer Experience” survey (DESNZ, 2026).
Yes, annual heat pump servicing costs £120-£180 in 2026 and is required to keep your manufacturer warranty valid. Without it, a compressor failure could cost £800-£2,500 to repair. Compare service plans from MCS-certified technicians to protect your investment.
- Annual heat pump service costs £120-£180 in 2026 (Energy Saving Trust).
- Skipping service voids warranty for Daikin, Mitsubishi, Vaillant, and Samsung.
- Compressor failure costs £800-£2,500 to fix without warranty cover.
- Service must be done by MCS-certified or manufacturer-trained technician.
- Less than half of UK owners had a service in the last 12 months (DESNZ 2026).
- Heat pump servicing requirements and annual checks
- Servicing is a warranty requirement for every major heat pump brand sold in the UK
- The service must be done by an MCS-certified or manufacturer-trained technician — not a general plumber
- The annual check covers six specific components — and the report must include refrigerant pressure
- Quick numbers — heat pump servicing costs, intervals, and failure rates
- You do not need a service to claim the Boiler Upgrade Scheme grant — but you do for the RHI
- The direct answer to "Do I need a heat pump service?" — yes, to keep your warranty and your grant valid
- How to verify your installer is MCS-certified and compliant for 2026 servicing
The direct answer is yes, you need an annual heat pump service if you want to keep your manufacturer warranty valid and, for older systems, your Renewable Heat Incentive (RHI) payments active. A standard service costs between £120 and £180 for an air-source heat pump in 2026 (Energy Saving Trust, 2026), which is roughly one-third of a gas boiler service but still a necessary annual expense.
Servicing is a warranty requirement for every major heat pump brand sold in the UK
The MCS Installation Standard MIS 3005 (Issue 6.0) states that manufacturers require an annual service to maintain the product warranty (MCS, 2026). This is not optional. DESNZ’s 2026 “Heat Pump Ready” programme data shows that voided warranties due to missing service records are the second most common consumer complaint (DESNZ, 2026).
Brands such as Daikin, Mitsubishi Electric, Vaillant, and Samsung all list annual servicing as a condition in their UK warranty terms. If you do not service the unit within the first 12 months of installation, the manufacturer can refuse a repair or replacement under warranty. A compressor failure alone can cost £800 to £2,500 to fix without warranty cover (DESNZ, 2026).
The service must be done by an MCS-certified or manufacturer-trained technician — not a general plumber
The MCS (Microgeneration Certification Scheme) is the only certification recognised by the UK government for heat pump installations and servicing (MCS, 2026). Ofgem’s 2026 Renewable Heat Incentive (RHI) closure guidance confirms that only MCS-certified installers can sign off service records for grant-eligible systems (Ofgem, 2026).
If your installer is not MCS-certified, you must use a manufacturer-trained technician to keep the warranty valid. You can check the MCS Installer Database at mcscertified.com or ask the manufacturer for their approved service partner list. A general plumber without MCS certification cannot produce a compliant service record.
The annual check covers six specific components — and the report must include refrigerant pressure
The EST’s 2026 “Heat Pump Servicing Guide” lists the mandatory checks: refrigerant pressure, compressor function, heat exchanger cleanliness, fan motor operation, defrost cycle (air-source), and brine circuit (ground-source) (Energy Saving Trust, 2026). A proper service report will include refrigerant pressure readings in bar or PSI, not just a “pass/fail” tick-box.
The service must also check the electrical connections and safety cut-out switches. If the technician cannot provide a refrigerant pressure reading, the service is not compliant with MCS standards. You should request a copy of the service certificate with these readings before paying.
Quick numbers — heat pump servicing costs, intervals, and failure rates
| Metric | Value | Source |
|---|---|---|
| Average service cost (air-source, 2026) | £120–£180 | EST “Heat Pump Servicing Guide” 2026 |
| Average service cost (ground-source, 2026) | £150–£250 | EST “Heat Pump Servicing Guide” 2026 |
| Required service interval | Annually | MCS MIS 3005 (Issue 6.0) |
| Percentage of owners who missed a service in 2025 | 52% | DESNZ “Heat Pump Consumer Experience” 2025/26 |
| Average repair cost if warranty voided | £800–£2,500 | DESNZ “Heat Pump Ready” programme data 2026 |
You do not need a service to claim the Boiler Upgrade Scheme grant — but you do for the RHI
The Boiler Upgrade Scheme (BUS) grant of £7,500 (from October 2025) does not require a service record at the time of application (GOV.UK, 2026). However, Ofgem’s 2026 BUS guidance states that if you later apply for a repair or replacement under the manufacturer’s warranty, a service record will be requested (Ofgem, 2026).
For systems still on the Renewable Heat Incentive (RHI), annual service records are mandatory to continue receiving payments. The RHI closure in 2022 means most new systems are on BUS, but existing RHI recipients must keep servicing. If you miss a service on an RHI system, you risk losing your quarterly tariff payments.
Yes, to keep your warranty and your grant valid
If you own a heat pump installed after 2022, an annual service is required to maintain the manufacturer’s warranty. If you receive RHI payments, a service is mandatory to avoid losing your tariff. If you do not service the unit, you risk a repair bill of £800–£2,500 for a compressor failure (DESNZ, 2026).
The service must be done by an MCS-certified or manufacturer-trained technician, and the report must include refrigerant pressure readings. Skipping the service is not a cost-saving measure — it is a gamble on a major repair bill.
How to verify your installer is MCS-certified and compliant for 2026 servicing
The MCS website (mcscertified.com) has a “Find an Installer” tool that lists all certified companies by postcode (MCS, 2026). Check that the installer’s MCS certificate number matches the one on your original installation paperwork. If the installer has dropped MCS certification, you must find a new MCS-certified technician for the service.
TrustMark registration is also recommended, as it covers consumer protection and dispute resolution (TrustMark, 2026). For gas-heat pump hybrid systems, the technician must also hold Gas Safe Register accreditation for the gas boiler side (Gas Safe Register, 2026).
guide to MCS certification requirements for heat pump owners
what to do if your heat pump warranty is refused
Frequently Asked Questions
Yes, annual servicing is required by every major heat pump brand sold in the UK to keep your warranty valid. The MCS Installation Standard MIS 3005 confirms this is not optional, according to MCS (2026).
A standard heat pump service costs between £120 and £180 for an air-source unit in 2026, according to the Energy Saving Trust. This is roughly one-third the cost of a gas boiler service.
Only an MCS-certified or manufacturer-trained technician can service your heat pump. The MCS (Microgeneration Certification Scheme) is the only UK government-recognised certification, as stated by MCS (2026).
Skipping annual servicing can void your warranty, leaving you liable for repair costs. A compressor failure alone can cost £800 to £2,500 to fix without warranty cover, based on DESNZ (2026) data.
Yes, for older systems, annual servicing is required to keep your Renewable Heat Incentive (RHI) payments active. Ofgem’s 2026 RHI closure guidance confirms this requirement.
