Bottom line: You could save up to £290 per year on your energy bills by replacing gas boilers with an air source heat pump, and with the government’s £7,500 grant through the Boiler Upgrade Scheme, you might only pay £500-£3,500 upfront after the discount.
If you’re thinking about making your home greener and cheaper to run, an air source heat pump could be a brilliant choice. These clever systems pull warmth from outdoor air—even when it’s cold—and use it to heat your home through your central heating system. But how much money can they actually save you?
The short answer is quite a lot. Many families are cutting hundreds of pounds from their yearly heating bills by making the switch. Let’s look at the real numbers and see if an air source heat pump makes sense for your home.
The Real Savings You Can Expect
The amount you’ll save depends on what heating system you’re replacing. Here’s what the numbers show for typical three-bedroom homes:
Replacing gas boilers: Most homes save around £290 per year on their energy bills when switching their a heating system.
Replacing an oil boiler: You could save up to £650 annually because oil heating is much more expensive to run.
Replacing electric heating: The savings can be even bigger, as electric heating is one of the most costly ways to warm your home.
Replacing LPG heating: Rural homes using LPG gas bottles often see savings of £400-£500 per year.
These savings add up quickly. Over 10 years, that’s nearly £3,000 back in your pocket if you’re replacing gas boilers—and much more if you’re ditching oil or electric heating. Over 20 years, which is how long heat pumps typically last, you could save £5,800 or more.
The exact amount depends on several factors, including how big your home is, how well insulated it is, and how much heating you currently use. But almost every home that switches from fossil fuels to an air source heat pump sees lower energy bills.
What Does It Cost to Run a Heat Pump?
Heat pumps run on electricity and typically cost between £450 and £1,700 per year to operate, depending on:
- How big is your home?
- How well insulated is your property?
- How warm do you like to keep your house
- What electricity tariff are you on
The great news? Air source heat works so efficiently that these systems produce 3-4 times more heat than the electricity they use. That’s why heat pumps run much more cheaply than you might think compared to systems that burn fossil fuels.
For comparison, here are typical yearly running costs for different heating systems in a standard three-bedroom home:
- Modern gas boiler: £850-£950
- Air source heat pump: £855-£1,200
- Oil boiler: £1,400-£1,600
- Electric heating: £2,000+
As you can see, even though heat pumps run on electricity, they compete well with gas boilers and beat oil and electric heating by miles.
How Heat Pumps Work Their Magic
Think of a heat pump unit like a fridge working backwards. Instead of taking heat out (like a fridge does), it takes warmth from outdoor air and brings it into your home through your central heating system. Even when it feels freezing outside, there’s still plenty of heat in the air that the heat pump works to capture and use.
Here’s how your heat pump works:
- The outdoor heat pump unit captures warmth from outside air
- A special fluid absorbs this heat and turns into a gas
- The gas gets compressed, making it much hotter
- This hot gas heats water that flows through your radiators and provides hot water
- The cycle starts again
Because the system moves heat rather than creating it from scratch by burning fossil fuels, it uses much less energy than traditional heating systems. This is why air source heat delivers such impressive energy efficiency.
The technology isn’t new—heat pumps have been keeping homes warm for decades. What’s changed is that modern heat pump units are much more efficient and work well even in cold British weather. Today’s air source heat pump can pull useful warmth from outdoor air even when temperatures drop to -15°C.
If you want to understand more about how this clever technology works, the Energy Saving Trust has excellent, detailed guides that explain everything in simple terms.
Government Help Makes Heat Pumps Affordable
Here’s where things get exciting. The UK government offers £7,500 through the Boiler Upgrade Scheme to help cover heat pump installation costs. If you live in a rural area, you might even get £9,000.
This massive discount transforms the economics. Instead of paying £8,000-£15,000 for a full heat pump installation, most people end up paying between £500 and £3,500 after the grant. That’s a huge difference and makes switching much more affordable.
The scheme is available if you:
- Own your property in England or Wales
- Currently have a gas, oil, electric, or LPG heating system
- Have a valid Energy Performance Certificate
- Use an MCS-certified installer
- Haven’t already received government funding for a heat pump
The scheme runs until 31st December 2027, and the government recently increased the budget to £295 million for 2025/2026, so there’s plenty of funding available. Your installer applies for the grant on your behalf, so you don’t need to worry about paperwork.
It’s worth noting that the grant doesn’t cover everything. You’ll still need to pay for any necessary upgrades to your central heating system, such as bigger radiators or improved insulation. But these improvements help your heat pump work even better and save you more money in the long run.
Why Choose Air Source Heat Pumps Over Ground Source?
You might wonder why we focus on air source heat rather than ground source heat pumps. There are good reasons why air source systems are much more popular:
Much Easier Installation: While ground source heat pumps need extensive digging or drilling in your garden, air source heat pump installation is much simpler. The outdoor heat pump unit just sits on a concrete pad outside your house.
Lower Upfront Costs: Air source systems cost around £8,000-£15,000 to install, whilst ground source heat pumps can cost £20,000-£45,000.
Perfect for Most Homes: Whether you live in a terraced house, semi-detached, or detached property, an air source heat pump can work. Ground source systems need lots of garden space.
Great Performance: Modern air source heat pump units work brilliantly in UK weather conditions and provide excellent energy efficiency.
Both types of heat pump work well, but air source heat pumps make more sense for most families because they’re cheaper and easier to install.
Making Your Heat Pump Even More Efficient
Want to boost your savings even more? Here are some smart moves that help your heating system work better:
Improve Your Insulation First: Better wall and loft insulation means your heat pump doesn’t have to work as hard. This keeps running costs down and makes your home more comfortable.
Choose the Right Electricity Tariff: Some energy suppliers offer special heat pump tariffs with cheaper off-peak rates. These can save you hundreds more each year because heat pumps run most efficiently when they operate steadily.
Consider Adding Solar Panels: Combining your air source heat pump with solar panels can slash energy bills even further. You create your own electricity during the day to power your heating system.
Use Smart Controls: Modern heat pump controls learn your household patterns and adjust automatically. This optimises energy efficiency without you having to think about it.
Keep Your System Well-Maintained: Clean filters and annual check-ups help your heat pump work at peak efficiency. This is much simpler than maintaining gas boilers.
What About Your Current Central Heating System?
Good news—you can usually connect an air source heat pump to your existing central heating system and radiators. However, some changes might be needed to get the best performance.
Heat pumps run at lower temperatures than gas boilers, so some radiators might need upgrading to larger ones. Don’t worry—your installer will check everything during their survey and explain exactly what’s needed.
Many homes also need a hot water cylinder if they currently have a combi boiler. This stores hot water for your taps and shower. Modern cylinders are well-insulated and don’t take up much space—they usually fit in an airing cupboard.
These upgrades are included in your quote, and remember that the £7,500 government grant helps cover the total cost. The result is a heating system that’s more efficient and provides better comfort than your old setup.
The Environmental Benefits
Beyond the money savings, switching from fossil fuels to an air source heat pump helps the planet, too. Gas boilers emit about 2,500kg of CO2 per year, whilst heat pumps only produce around 850kg. That’s a massive 66% reduction in your home’s heating emissions.
As the UK’s electricity supply gets cleaner with more wind and solar power, heat pumps become even more environmentally friendly. Eventually, your heating system could be completely carbon-free if powered by renewable electricity.
This environmental benefit matters for your home’s value, too. Properties with modern, efficient heating systems are more attractive to buyers. Energy-efficient homes are the future, and installing an air source heat pump puts you ahead of the curve.
Common Questions About Air Source Heat Pumps
Do heat pumps work in cold weather? Yes, absolutely. Modern air source heat pump units work efficiently even when outdoor air temperatures drop well below freezing. They’re designed for British weather.
Are heat pumps noisy? Today’s heat pump units are much quieter than older models. Most produce less noise than a typical washing machine and are no louder than gas boilers.
How long do heat pumps last? Air source heat pumps typically last 20-25 years with proper maintenance, compared to 10-15 years for gas boilers. This longer lifespan means better value for money.
Do I need planning permission? Most heat pump installations count as ‘permitted development’, so you probably won’t need planning permission. Your installer will check this for you.
Is a Heat Pump Right for Your Home?
Heat pumps work brilliantly for most UK homes, but they’re particularly good if you’re currently using:
- Old, inefficient gas boilers (especially those over 10 years old)
- Oil heating systems
- Electric heating systems
- LPG heating in rural areas
The older and less efficient your current heating system is, the more money you’ll save by switching to an air source heat pump.
Heat pumps are also excellent for new-build homes or properties undergoing major renovations. Installing efficient heating from the start makes perfect sense.
Even if you have a relatively new gas boiler, it’s worth getting a quote. The government grant makes switching much more affordable, and you’ll benefit from lower running costs for the next 20+ years.
Next Steps to Start Saving
Ready to start saving money and helping the environment? Here’s what to do:
- Get a Free Home Assessment: Contact our team at Greener Homes for a no-obligation survey of your property
- Check Your Grant Eligibility: We’ll help you apply for the £7,500 government grant and handle all the paperwork
- Compare Your Options: We’ll design the perfect air source heat pump system for your home and budget
- Professional Heat Pump Installation: Our MCS-certified engineers will handle everything from start to finish
The numbers don’t lie—air source heat pumps genuinely save most families hundreds of pounds every year whilst making homes greener and more comfortable. With government grants covering most of the installation cost, there’s never been a better time to make the switch from fossil fuels to clean heating.
Don’t wait too long, though. The Boiler Upgrade Scheme runs until the end of 2027, but with growing demand for heat pump installation, it’s smart to get your application in sooner rather than later.
Want to learn more about how heat pumps could transform your home? Visit our heat pump guide for everything you need to know about making the switch.
