Do Heat Pumps Need Maintenance?
Heat pumps require significantly less maintenance than gas boilers — there is no combustion, no flue, and no annual gas safety certificate. However, they do need an annual professional service (£100–£200) plus simple DIY checks every few months. With both in place, a heat pump will deliver 20–25 years of efficient heating.
Heat pump maintenance for UK homeowners falls into two categories: an annual professional service and simple DIY checks you can carry out yourself throughout the year. Get both right, and your heat pump will reward you with reliable, efficient heating for decades.
Related reading: How much does a heat pump cost in 2026? | Air source heat pump vs gas boiler
Annual Service: What It Includes and Why It Matters
An annual service by a qualified engineer is the cornerstone of heat pump maintenance. It is a thorough check-up that ensures everything is operating safely and at peak efficiency — similar to an annual boiler service but focused on different components.
What a heat pump service includes
A professional annual service typically covers:
Outdoor unit checks: - Visual inspection of the outdoor unit for damage, corrosion, or debris - Cleaning the evaporator coil (the large finned area that absorbs heat from the air) - Checking and clearing the condensate drain to prevent blockages - Inspecting the fan for wear, balance, and noise - Checking refrigerant pressure (to detect any leaks) - Verifying the defrost cycle operates correctly - Checking electrical connections and tightening terminals
Indoor unit and controls checks: - Inspecting the flow and return temperatures to ensure correct operation - Checking system pressure in the heating circuit - Verifying the controller settings and hot water schedule - Testing the legionella pasteurisation cycle is active and functioning - Checking the expansion vessel pressure (both heating and hot water) - Inspecting the immersion heater function
Hot water cylinder checks: - Testing the temperature and pressure relief valve (TPR valve) - Checking the cylinder temperature at the thermostat - Inspecting the anode rod (if fitted) — sacrificial anodes protect the cylinder from corrosion - Verifying insulation is intact
System-wide checks: - Running a full system diagnostic via the heat pump’s built-in monitoring - Checking the Seasonal Coefficient of Performance (SCOP) against expected benchmarks - Reviewing energy consumption data for any anomalies - Advising on any settings adjustments to improve efficiency
How long does a service take?
A typical annual heat pump service takes 60–90 minutes. Your engineer should leave you with a written service report detailing what was checked and any recommendations.
How Much Does a Heat Pump Service Cost?
The cost of an annual heat pump service in the UK typically ranges from £100 to £200, depending on the brand, location, and whether any minor works are needed.
| Service type | Typical cost | What is included |
|---|---|---|
| Basic annual service | £100–£150 | Inspection, cleaning, diagnostics |
| Comprehensive service | £150–£200 | As above, plus filter replacement, refrigerant pressure check, full written report |
| Service plan (annual direct debit) | £8–£15/month | Annual service, priority callouts, parts discount |
Is a service plan worth it?
Some installers and manufacturers offer annual service plans or maintenance contracts. These typically cost £8–£15 per month and include:
- One annual service visit
- Priority response for breakdowns
- Discounted or free parts and labour for repairs
- Ongoing warranty compliance
For most homeowners, a service plan offers peace of mind and works out slightly cheaper than paying for ad-hoc services. It also ensures you never forget to book your annual service, which is important for warranty compliance.
Comparing to gas boiler maintenance
A gas boiler service typically costs £70–£120, plus an annual Gas Safety Certificate if you are a landlord (£60–£90). A heat pump has no gas safety requirement, so the overall annual maintenance cost is comparable — and you get a system that lasts almost twice as long.
Related reading: Air source heat pump vs gas boiler: the complete comparison
DIY Checks: What You Can Do Yourself
Between annual services, there are several simple checks you can carry out to keep your heat pump in top condition. None of these require specialist knowledge or tools.
Annual maintenance checklist for homeowners
Use this checklist throughout the year. We recommend checking these items every three months or so:
Monthly checks (takes 2 minutes):
- Check airflow around the outdoor unit — Ensure nothing is blocking the front, sides, or top of the unit. Keep a clear space of at least 300mm on all sides. Remove any garden furniture, plant pots, or bin bags that have crept too close.
- Listen for unusual noises — Your heat pump should hum quietly. If you hear rattling, grinding, or clicking, investigate or call an engineer.
Quarterly checks (takes 10 minutes):
- Clear leaves and debris — In autumn and winter especially, leaves, twigs, and garden waste can accumulate around the outdoor unit and block the evaporator. Gently brush or wash them away.
- Check the condensate drain — The outdoor unit produces condensate water. Make sure the drain pipe is clear and water can flow away freely. A blocked drain can cause ice build-up in winter.
- Inspect the outdoor unit base — Check that the unit is sitting level and stable on its mounting feet or anti-vibration pads. Any tilting or movement should be investigated.
- Check your system pressure — Look at the pressure gauge on your indoor unit or controller. It should typically read between 1.0 and 1.5 bar when cold. If it has dropped below 1.0 bar, the system may need topping up (your annual service engineer can do this).
Every six months:
- Clean or replace air filters — Some heat pump systems have accessible filters that can be cleaned or replaced. Check your owner’s manual for the location and procedure.
- Review your energy consumption — Most modern heat pumps have apps or displays showing energy use. Compare month-on-month to spot any unexpected increases that could indicate a problem.
- Check your hot water temperature — Run a hot tap and check the temperature with a thermometer. It should be delivering water at 48–55°C. Significant drops may indicate a control issue.
Annual (before your service visit):
- Note any concerns — Write down anything unusual you have noticed throughout the year — strange noises, temperature fluctuations, error codes on the display. Share these with your service engineer.
- Check defrost operation in winter — During cold spells, your heat pump’s outdoor unit will periodically defrost. This is normal and you may see steam rising from the unit. If the unit appears heavily iced up and is not defrosting, contact your installer.
Warranty Conditions: Do Not Void Your Cover
Most heat pump manufacturers offer a warranty of 5–7 years on the unit, with some offering up to 10 years through their installer network. However, these warranties almost always come with conditions — and failing to meet them can void your cover.
Common warranty conditions
| Requirement | Typical condition | Why it matters |
|---|---|---|
| Annual service | Must be serviced annually by a qualified engineer | Proves the system has been maintained correctly |
| Registered installer | Must be installed by an MCS-certified or manufacturer-approved installer | Ensures correct installation from day one |
| Genuine parts | Any replacement parts must be genuine or manufacturer-approved | Prevents damage from incompatible components |
| No DIY modifications | No tampering with refrigerant circuit, controls, or wiring | Refrigerant work requires F-Gas certification |
| Service records | Written records or digital logs of all services | Evidence of compliance if a claim is needed |
Tips to protect your warranty
- Keep all paperwork — Your installer should provide a commissioning certificate, warranty registration, and service records. Store these safely.
- Book your service on time — Do not let the annual service lapse. Set a reminder or sign up for a service plan.
- Use qualified engineers — For any repair or service work, use an MCS-certified or manufacturer-approved engineer.
- Register your warranty — Some manufacturers require you to register your heat pump online within 30 days of installation. Check with your installer.
- Report issues promptly — If you notice a fault, contact your installer sooner rather than later. Running a faulty system can cause secondary damage that may not be covered.
Related reading: Best heat pump brands in the UK: honest 2026 comparison
When to Call an Engineer
While DIY checks cover the basics, there are situations where you should call a qualified heat pump engineer without delay.
Call an engineer if you notice:
- Error codes on the display — Most heat pumps display fault codes. Do not try to reset repeatedly — note the code and call your installer.
- Significant drop in performance — If your home is not reaching temperature or hot water is lukewarm, something may be wrong with the compressor or controls.
- Unusual noises — Grinding, banging, or high-pitched whining can indicate a failing component.
- Refrigerant leak — If you notice oily residue around the outdoor unit or a sweet chemical smell, there may be a refrigerant leak. This requires an F-Gas certified engineer.
- Persistent icing — Frost on the outdoor unit during cold weather is normal; thick ice that does not clear after a defrost cycle is not.
- Water leaks — Any water appearing where it should not — around the indoor unit, cylinder, or pipework — needs investigating.
- Electrical tripping — If the heat pump is tripping your circuit breaker, do not keep resetting it. There may be an electrical fault that needs diagnosis.
What NOT to do
- Do not attempt to open the outdoor unit casing — There are high-voltage electrical components and pressurised refrigerant inside.
- Do not top up refrigerant yourself — This is illegal without an F-Gas qualification and can be dangerous.
- Do not adjust the refrigerant circuit valves — These are factory-set and calibrated during commissioning.
- Do not pressure-wash the outdoor unit — A gentle rinse with a garden hose is fine; a pressure washer can damage the delicate evaporator fins.
Expected Lifespan: How Long Will Your Heat Pump Last?
A well-maintained air source heat pump is expected to last 20–25 years — roughly twice the lifespan of a gas boiler (typically 12–15 years). This longevity is one of the strongest arguments for investing in a heat pump.
Why do heat pumps last longer?
- No combustion — There is no flame, no burn chamber, and no flue. Combustion is the primary cause of wear in gas boilers.
- Fewer moving parts — A heat pump’s main moving component is the compressor, which is designed for decades of continuous operation.
- Lower operating temperatures — Heat pumps work at much lower temperatures than gas boilers, reducing thermal stress on components.
- Sealed refrigerant circuit — The refrigerant loop is factory-sealed and, in a well-installed system, should never need topping up.
What wears out eventually?
Even the best heat pump will need some component replacements over its lifetime:
| Component | Expected lifespan | Typical replacement cost |
|---|---|---|
| Compressor | 15–25 years | £800–£1,500 |
| Fan motor | 10–15 years | £200–£400 |
| Controller/PCB | 10–20 years | £300–£600 |
| Expansion valve | 15–20 years | £150–£300 |
| Hot water cylinder | 25+ years | £500–£1,200 |
These are worst-case scenarios. Many heat pumps run for their entire lifespan without needing anything beyond routine servicing.
The cost comparison over 25 years
When you factor in maintenance and replacement costs over 25 years, a heat pump comes out well ahead of a gas boiler:
| Item | Heat pump (25 years) | Gas boiler (x2, 12.5 years each) |
|---|---|---|
| Installation cost | £10,000–£14,000 | £6,000–£8,000 (x2 = £12,000–£16,000) |
| BUS Grant (subject to eligibility) | -£7,500 | £0 |
| Annual service (x25) | £3,000–£5,000 | £1,750–£3,000 (+ gas safety certs) |
| Repairs over lifetime | £500–£1,500 | £1,000–£2,000 (x2) |
| Total cost of ownership | £6,000–£13,000 | £14,750–£21,000 |
Add in lower running costs from the heat pump’s superior efficiency, and the financial case is clear (Energy Saving Trust).
Related reading: Heat pump running costs: what do you actually pay in 2026? | Heat pump hot water cylinder guide
How Electromatic Can Help
Electromatic M&E Ltd offers free home surveys across London and Surrey (TW, KT, SW postcodes). We handle BUS Grant applications (subject to eligibility criteria set by Ofgem), install ASHP and solar PV from a single contractor, and deliver within 2–4 weeks of survey confirmation. All work is carried out under MCS certification via our accredited umbrella partner. We also offer annual service visits and maintenance plans for all major heat pump brands in our service area.
Call us: 07718 059 284 | Email: admin@electromatic.uk
Frequently Asked Questions
How often should a heat pump be serviced?
Once a year is the standard recommendation for all major heat pump brands in the UK. Annual servicing ensures the system is running efficiently, maintains your warranty, and catches any minor issues before they become expensive problems.
Can I service my heat pump myself?
You can carry out basic maintenance like clearing debris, checking airflow, and monitoring system pressure. However, the annual professional service must be carried out by a qualified engineer. Work on the refrigerant circuit specifically requires F-Gas certification, which is a legal requirement.
What happens if I do not service my heat pump?
Skipping services can lead to reduced efficiency (higher energy bills), undetected faults that worsen over time, and voided manufacturer warranty. In extreme cases, a blocked condensate drain or failed defrost cycle can cause physical damage to the unit.
Is heat pump maintenance more expensive than gas boiler maintenance?
It is broadly comparable. A heat pump service costs £100–£200 per year, while a gas boiler service costs £70–£120 plus an annual gas safety certificate for landlords (£60–£90). The heat pump’s longer lifespan (20–25 years vs 12–15 years for a gas boiler) means you replace it far less often, which more than offsets any small difference in annual service costs.
Do I need a separate maintenance contract for the hot water cylinder?
No. The hot water cylinder checks are typically included as part of your annual heat pump service. Your engineer will inspect the pressure relief valve, expansion vessel, and immersion heater as standard. Cylinders themselves require very little maintenance and are built to last 25+ years.
The information in this article is for general guidance only and does not constitute financial, legal, or technical advice. Service cost ranges are indicative based on typical UK market rates and may vary by brand, location, and scope of work. Warranty conditions vary by manufacturer — always check your specific warranty documentation. The Boiler Upgrade Scheme (BUS) grant of £7,500 is subject to eligibility criteria set by Ofgem — not all properties qualify. Electromatic M&E Ltd operates under MCS certification via our accredited umbrella partner. All installations comply with Building Regulations Part L and MCS standards. E&OE.
Written by Electromatic M&E Ltd — ASHP & Solar installer, London & Surrey (electromatic.uk)
Last updated: April 2026 | Electromatic M&E Ltd, Company No. 13837345
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