Installation
Heat pump servicing and maintenance: costs, checklist and frequency (UK 2026)
Last updated 2026-09-14
An air source heat pump is designed to run for long periods through winter, so regular maintenance matters. A neglected system can become less efficient, noisier and more expensive to run — while a small fault can turn into a no-heating callout on the coldest day of the year.
The good news is that heat pump servicing is usually straightforward. Most homeowners need one professional service each year, plus a few simple checks during the heating season. This guide explains the typical heat pump servicing cost in the UK, what an engineer checks and what you can do yourself.
Short answer: budget roughly £150–£300 for an annual air source heat pump service. Book it before autumn, ideally with an MCS-certified or manufacturer-approved engineer who can maintain both the outdoor unit and indoor heating controls.
How often does a heat pump need servicing?
For most UK homes, an air source heat pump should be professionally serviced once every 12 months. Autumn is a sensible time because the system is about to work hardest, but the exact month is less important than keeping a regular record.
A new installation should also be checked during commissioning and handover. Your installer should explain the controls, record the system settings and give you the maintenance and warranty requirements. Ground source systems usually follow the same annual timetable, although the ground loop and circulation equipment may need additional checks.
How much does a heat pump service cost?
| Service | Typical UK price | What it usually covers |
|---|---|---|
| Standard air source heat pump service | £150–£300 | Outdoor unit, indoor unit, controls and basic performance checks |
| Ground source heat pump service | £200–£400 | Heat pump, brine circuit, pumps, filters and system pressures |
| Emergency diagnostic visit | £100–£250+ | Callout and diagnosis; repairs and parts are normally extra |
| Service plan | £15–£35/month | Annual service with varying levels of breakdown cover |
Prices are guide ranges, not quotes. London and remote areas may cost more, and some providers charge separately for the hot-water cylinder or ventilation cleaning.
What is included in an annual heat pump service?
A proper service should be more than a quick visual glance at the outdoor fan. Ask the engineer to provide a written report showing readings, faults found and any recommendations. A typical visit includes:
- Outdoor unit: inspect the fan, coil, casing, drain and anti-vibration mounts; remove leaves or debris that restrict airflow.
- Refrigerant circuit: check for signs of leaks, abnormal pressures and temperature performance. Refrigerant work must be handled by an appropriately qualified engineer.
- Water and heating circuit: check pressure, strainers, pumps, expansion vessel, valves and signs of leaks.
- Electrical safety: inspect connections, isolators, cables and protective devices.
- Controls: test thermostats, weather compensation, schedules, sensors, hot-water priority and any app connection.
- Performance: compare flow and return temperatures, operating current and system behaviour against the design settings.
- Indoor equipment: inspect the cylinder, immersion heater, filters and accessible pipework where these form part of the heat pump system.
Heat pump maintenance you can do yourself
Homeowner checks help prevent avoidable problems, but they do not replace an annual professional service. Switch the system off according to the manufacturer’s instructions before cleaning nearby surfaces, and never remove sealed covers or work on wiring.
- Keep the outdoor unit clear. Remove leaves, grass and rubbish from around the fan and leave the manufacturer’s clearance space open. Do not box the unit in with a solid screen.
- Check the air intake and coil. Light surface dirt can be brushed away gently. Do not use a pressure washer or bend the delicate fins.
- Keep filters clean. If your indoor unit has an accessible filter, follow the manual’s cleaning interval. A clogged filter reduces airflow and efficiency.
- Watch the display and app. Note recurring warning codes, unusual cycling, new rattling sounds or a drop in hot-water performance and tell the engineer.
- Check for leaks. Look around the indoor unit, cylinder and visible pipework. A small water leak should be investigated promptly.
What happens if you skip servicing?
Skipping one service does not automatically damage a heat pump, but the risks build over time. Dirt on the heat exchanger restricts airflow, poor water pressure reduces heat transfer and a developing electrical or refrigerant fault can make the compressor work harder.
The practical consequences can include higher electricity bills, colder rooms, more defrost cycles, increased noise and an avoidable breakdown. Missing the manufacturer’s maintenance schedule may also make a warranty claim more difficult, so keep the engineer’s report and receipts.
How to find a qualified heat pump service engineer
Start with the original installer or the manufacturer’s approved-service directory. For grant-funded installations, use an MCS-certified installer where appropriate and check that the engineer is competent for your refrigerant type and system manufacturer.
Before booking, ask three questions:
- Does the price cover the outdoor unit, indoor unit, cylinder and controls?
- Will I receive a written service report with readings and recommendations?
- Are parts, refrigerant work and follow-up repairs excluded or included?
Heat pump servicing: quick checklist
| When | Action |
|---|---|
| Monthly in winter | Keep the outdoor unit clear and check for unusual noises, error codes or leaks. |
| As instructed | Clean accessible indoor filters and review the system pressure. |
| Every 12 months | Book a full professional service and keep the written report. |
| After a fault | Record the warning code and contact a qualified engineer rather than repeatedly resetting the system. |
Frequently asked questions
How often should a heat pump be serviced?
Most UK air source heat pumps should receive a professional service once a year. Annual servicing checks the refrigerant circuit, electrical connections, controls, water pressure, filters and safety systems before the main heating season.
How much does a heat pump service cost in the UK?
A standard air source heat pump service typically costs about £150 to £300 in the UK, depending on the system, location and whether the cylinder, controls and indoor unit are included. Complex repairs and replacement parts cost extra.
Is heat pump servicing required for the warranty?
Many manufacturers require regular servicing by a qualified or approved engineer as a condition of an extended warranty. Check your own warranty terms and keep service invoices and reports as proof.
Can I maintain my heat pump myself?
You can keep leaves and snow away from the outdoor unit, clean accessible air filters, check warning messages and keep the area clear. Refrigerant work, electrical repairs and sealed-system work should be left to a qualified engineer.
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