Most air-source heat pumps last around 15-20 years. Lifespan depends heavily on installation, sizing, maintenance, usage, and component quality. While the initial cost of an air source heat pump can be substantial, over its lifetime, it’s often more cost-efficient than other heating systems.
Like any device, an air source heat pump’s lifespan is determined by how it’s maintained. If it’s properly cared for, it can last 20+ years, whereas if it’s neglected, it might not last 10.
Thankfully, most maintenance factors are things homeowners control. Below, we explain how long air source heat pumps really last, what factors matter most, and how you can prolong their lifespan.
In this article we’ll discuss:
- The Average Lifespan of an Air Source Heat Pump
- 5 Critical Factors That Affect Heat Pump Longevity
- Essential Air Source Heat Pump Maintenance
- Why Annual Professional Servicing Matters
- Signs Your Heat Pump Needs Repair or Replacement
The Average Lifespan of an Air Source Heat Pump
Most systems last around 15-20 years.
Air source heat pumps are a renewable heating solution that draws heat from the external air, transferring it into water. That water is then used to warm your home or provide hot water from taps or showers.
That’s important to understand because it means there are relatively few moving parts. Where a boiler might last around 10-12 years, in a heat pump, the main thing that can break is the compressor. Usually, this can be replaced. But if not, you can get a newer, more efficient model.
Many manufacturers offer a 5-year warranty on parts and a 1-year labour warranty. With routine servicing, your heat pump can last for decades.
Do air source heat pumps work less efficiently as they get older?
They can do. Age alone does not automatically mean a heat pump is less efficient. Usually, a drop in efficiency is due to worn-out parts, dirty coils, restricted airflow, or poorly set controls. However, if properly maintained, an older heat pump can still perform well.
Look for rising bills, longer heating times, or frequent faults as warning signs of something wrong with the heat pump.
Also, air source heat pumps can be comparatively less efficient than newer models due to advances in technology.
5 Critical Factors That Affect Heat Pump Longevity
1. Installation Quality
Professional installation is critical. Bad pipework, weak commissioning, poor insulation, or incorrect settings can shorten the system’s lifespan from the start.
You might think you’re saving money on a cheap installation, but it may cost more long term if it leads to repeat repairs or poor efficiency.
2. Correct System Sizing
The air source heat pump should be sized relative to a property’s heat demand, insulation, hot water needs, or radiator/underfloor heating setup.
If not, it can lead to:
- An undersized system may struggle in cold weather and rely too much on backup heating.
- An oversized or poorly configured system may cycle too often, increasing wear.
3. Climate and Environment
Ground source heat pumps get the benefit of being buried underground. Air source heat pumps, however, might be designed to handle UK weather, but they’re still exposed to all the elements.
In coastal environments, for example, salt air can increase the corrosion risk, while snow, debris, or poor drainage can block airflow and reduce performance.
4. Usage Patterns
Heat pumps aren’t designed to be turned off and on. They work best when they’re set up to run steadily. Constantly forcing the system to heat up quickly will increase strain and reduce efficiency in the long term.
5. Quality of Components
Better-quality units will obviously last longer. It’s smart to opt for stronger components, better controls, longer warranties, and easier access to parts.
That said, budget systems aren’t always bad. Just pay close attention to the warranty, installer support, manufacturer reputation, and parts availability.
Essential Air Source Heat Pump Maintenance: A Homeowner’s Checklist
You don’t need to be a heating engineer to look after an air source heat pump. Follow these basic checks:
- Keep the outdoor unit clear of leaves, weeds, snow, and garden debris so air can move freely around it.
- Listen for unusual noises, including rattling, buzzing, grinding, or excessive vibration.
- Look for visible leaks, corrosion, loose panels, damaged pipework, or other signs of physical damage.
- Check the controller or app for fault codes, warning messages, or unusual performance changes.
- Keep vents, grilles, accessible filters, external pipe insulation, service records, and warranty documents in good order.
These checks aren’t a replacement for a professional service. But they can help you spot problems early. If you identify any issues, it’s important to contact a professional.
Does the outdoor unit need to be covered in winter?
Usually, no.
Most air-source heat pumps are designed to be outside in winter, especially in the UK. Just keep the device clear of snow, leaves, and debris. If you do add a cover, it must allow full airflow and be suitable for heat pumps. Never block airflow, as it can stop the heat pump from working correctly.
Why Annual Professional Servicing Matters
An air source heat pump should be serviced once a year. During the service, a professional will review every aspect of the heat pump, inspecting electrical connections, checking everything from coils to strainers, and reviewing any fault codes.
A comprehensive service can catch small faults before they become expensive repairs. Plus, it’s often required to keep the warranty valid.
How much does a professional heat pump service cost?
That depends on the heat pump, location, engineer, and service scope. However, you can usually expect to pay around £150 to £300. Don’t choose a service that’s too basic, as it can miss potential issues.
If there are any repairs necessary, it can increase the cost.
Signs Your Heat Pump Needs Repair or Replacement
Unless your heat pump suddenly stops working, it can be difficult to know if there’s anything wrong. You’ll mainly want to monitor efficiency. If energy bills rise, hot water is tepid, or rooms take longer to heat, there might be an issue.
Other potential factors include:
- Frequent error codes or system lockouts.
- Repeated icing on the outdoor unit.
- Loud rattling, grinding, buzzing, or fan noise.
- Leaks around pipework or indoor components.
- Reduced airflow.
- Short cycling or constant stopping and starting.
- Burning smells, tripped breakers, or obvious electrical issues.
- Visible corrosion or damage.
Is it time for an upgrade? Modern efficiency vs ageing units
When is it better to repair or replace?
If the system is still relatively young, it usually makes sense to repair it. That’s especially true if you still have access to replaceable parts.
However, if the system is older (15+ years), it might be sensible to opt for a newer, more efficient model. We can help advise you on the best option for your system and home.
Premium Heating and Plumbing has extensive experience with air source heat pumps, offering everything from installation to servicing and repairs. Get in touch if you think your heat pumps need looking at.
Read Next: How Heat Pumps Compare to Traditional HVAC Systems
