Do air source heat pumps need servicing?

Air source heat pumps have become a familiar sight across towns and countryside homes in the UK, thanks to the growing push for low-carbon heating and rising interest in long-term energy savings. As more households consider replacing traditional boilers with this cleaner alternative, one of the most common questions that crops up is whether air source heat pumps actually need servicing. After all, many people assume that because heat pumps run mostly on electricity and have fewer moving parts than gas boilers, they can simply be left alone.

The truth is a little more nuanced. While air source heat pumps are indeed low-maintenance, they still require routine servicing and simple homeowner checks to keep them running smoothly, efficiently, and safely. Neglecting servicing can lead to reduced performance, higher running costs, or avoidable breakdowns. Below is a full, clear look at what servicing involves, how often it should be done, what homeowners can manage themselves, and why proper maintenance is key for long-term reliability.

Do air source heat pumps actually need servicing?

Yes, air source heat pumps do need servicing, even though they require far less attention than a traditional boiler. A heat pump works by transferring heat from the outside air into your home, which requires refrigeration cycles, electrical components, fans, coils and sensors to work harmoniously. Just like any sophisticated system, it benefits from routine care.

Most UK manufacturers recommend an annual service carried out by a qualified engineer. This ensures the system stays efficient, meets warranty requirements, and avoids small issues turning into expensive problems later on.

You wouldn’t drive a car for years without a service, even if it’s running perfectly well. Heat pumps follow the same idea: light maintenance, regularly, keeps everything performing at its best.

Why servicing matters

A properly serviced air source heat pump can make a noticeable difference to energy bills and day-to-day comfort levels. Here’s why servicing is more than just a formality:

1. Protects efficiency

A heat pump’s efficiency is one of its main selling points. Dirt on coils, obstructed airflow or a minor refrigerant imbalance can cause the system to work twice as hard for the same output. A yearly tune-up keeps it operating within optimal performance levels.

2. Reduces running costs

If a heat pump has to strain due to blockages or minor faults, electricity consumption naturally rises. Servicing helps keep these extra costs at bay by restoring smooth performance.

3. Extends lifespan

A well-maintained heat pump can last 15–20 years or more. Without servicing, parts may deteriorate faster than expected. Spending a modest amount each year on maintenance could save thousands in early replacement costs.

4. Detects issues early

Small problems—loose electrical connections, worn fan motors, minor leaks—are easy to fix when caught early. Left unchecked, they can develop into system failures.

5. Maintains warranties

Many UK heat pump manufacturers require annual servicing to keep warranties valid. If servicing is skipped, homeowners may lose out on repair cover.

6. Keeps your home comfortable

Consistent heating output, good hot water temperatures, and smooth airflow all depend on a system that’s been checked and calibrated.

What does a heat pump service involve?

An annual service is usually quite straightforward and typically lasts less than an hour or two. A qualified engineer will run through a comprehensive checklist, including:

Visual checks

• Condition of the outdoor unit
• Signs of physical damage
• Any debris, blockages, or plant growth around the system

Mechanical and electrical inspection

• Fan motors and blades
• Electrical connections
• Control settings and thermostats
• System pressure and refrigerant levels

Performance checks

• Heating output
• Coefficient of performance (COP) where applicable
• Temperature readings

System responsiveness

• Cleaning
• Outdoor coils
• Drip trays
• Filters
• Airflow pathways

Software and controls

• Updates to controller firmware (if applicable)
• Calibrating sensors
• Optimising settings for heating curves and weather compensation

Refrigerant check

• Although heat pumps are sealed systems, an engineer will confirm there are no leaks and the refrigerant is at correct levels.

Noise and vibration tests

• Minor adjustments can often calm unexpected rattles or vibrations.
• After servicing, you should receive a report confirming the checks carried out and any recommendations.

How often should a heat pump be serviced?

For most UK households, once a year is perfectly adequate. This aligns with industry guidance, manufacturer recommendations, and insurance/warranty terms.
Some households, however, might benefit from more frequent checks:

• Homes in coastal areas – salt in the air can affect components
• Properties with high usage – e.g. large households relying heavily on hot water
• Systems supporting underfloor heating – extra load requires closer monitoring

But for most homes, an annual visit is more than enough.

What monthly or seasonal checks can homeowners do?

While the technical side should be left to trained engineers, there are simple routine checks homeowners can carry out to maintain peak performance.

Outdoor unit care

• Keep plants, grass, and shrubs trimmed back at least 30cm from the unit
• Remove leaves or debris from around the casing
• Ensure there’s good airflow on all sides

Clear snow and ice in winter

• The heat pump defrosts itself, but ensuring the base and surrounding area are clear helps it do so effectively.

Indoor filters

• If your system uses indoor air handling units, clean or replace filters every few months.

Check for unusual noises

• Most heat pumps operate quietly. Whirring, grinding, or metallic noises should be investigated.

Monitor performance

• If you notice rising energy usage or dips in heating output, it may indicate a servicing need.

These small steps help keep the system in good form until the annual professional check.

Signs your air source heat pump may need attention

Heat pumps are reliable, but certain symptoms indicate it’s time to book a service sooner rather than later:

• Sudden increase in electricity bills
• Reduced heating output
• Longer time to reach desired temperature
• Unexpected noises from the outdoor or indoor unit
• Short cycling (turning on and off too often)
• Ice buildup that doesn’t clear
• Odd smells from indoor blowers

Catching these early avoids bigger headaches later on.

Is heat pump servicing expensive in the UK?

Costs vary slightly by region, but most annual services fall between:

• £155 – £350 per year

Higher-end systems or those installed in harder-to-reach areas might cost a little more. Many installers offer service plans which can spread the cost and include priority call-outs.

When you compare that to the cost of a boiler service, which often sits between £120 and £275, heat pump servicing is slightly more—but the system typically saves far more on energy bills over its lifetime, especially with smart-set heating curves and good insulation.

Does the installer need to perform the service?

Not necessarily. Any certified engineer trained in heat pump technology can carry out the service, though many homeowners choose to stick with their original installer for familiarity and ease.

Look for credentials such as:

• F-Gas certification
• MCS accreditation (Microgeneration Certification Scheme)
• Experience with your specific brand (Mitsubishi, Daikin, Samsung, Vaillant, etc.)

Are air source heat pumps low maintenance overall?

Absolutely. One of the biggest advantages of heat pump technology is the reduced need for intensive maintenance. Unlike gas boilers, which rely on combustion, heat pumps use a clean, sealed system with fewer moving parts.

Most households only need to:

• Keep the outdoor unit clear
• Clean filters occasionally
• Schedule an annual service

For something that provides heating and hot water all year round, that’s remarkably light work.

The Bottom Line: Do air source heat pumps need servicing?

Air source heat pumps are built for long-term reliability, efficient heating, and low running costs. But to keep them performing at their best, annual servicing is essential. It protects efficiency, prevents problems, and ensures the system stays within warranty.

Although maintenance needs are much lighter compared to gas boilers, a little attention goes a long way. Most servicing is quick, straightforward, and affordable—and the long-term savings in performance, lifespan and energy use more than justify it.

If you own or are considering installing an air source heat pump, think of servicing as part of good household care: simple, predictable, and vital to keeping your home warm and efficient through the British seasons.

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