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Air to Water Heat Pump in the UK: Guide October 2025
- An air to water heat pump works bytransferring heat from the air outside to a water storage tank. This way, the water is warmed up and supplied to your radiators, underfloor heating, and taps.
- The biggest advantage of an air to water heat pump is that it canefficiently generate usable energy for your home, whilereducing your carbon footprint.
- The cost of an air to water heat pump ranges from£8,000 to £15,000, excluding installation costs.
- The savings you can expect with an air to water heat pump can be anywhere up to£1,200 per year, depending on your existing heating system.
An air to water heat pump can be a great addition to your household if you’re looking to reduce your carbon footprint and avoid overspending on energy bills. In this guide, we explore the ins and outs of this energy source, delving into its benefits, available heat pump grants, and installation considerations.
If you’re ready to reap the benefits of this type ofair source heat pump, then we can also help you get the installation process started. The first and most important step is to find a reliable installer you can trust to offer you tailored advice and high-quality services. Looking for one on your own can take hours or even days of tedious research. Fortunately, we’re here to help you skip the hassle.
By simply filling in our30-second form, we can quickly connect you withup to 4 vetted heat pump installers. You can then easily compare the installers and prices to secure the best deal for your home. All quotes arenon-binding and completely free. Click the button below to get started now!
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- Save £7,500 with BUS grant
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What is an air to water heat pump?
Air-to-water heat pumps are renewable energy systems thatextract heat from outdoor air using a refrigerant cycle towarm up your home and provide hot water. The process can also be reversedfor cooling purposes.
They work by transferring heat to awater storage tank. The heated water is then distributed to yourradiators,underfloor heating,taps,showers, andbaths. Compared toheat pump water heaters or air to airmini split heat pumps, which cannot supply your home with hot water, air to water heat pumps are highly versatile.
Systems like these are ideal for homes that need both space heating and hot water. They are similar in function to awater source heat pump system, which operates in much the same way but draws heat from a nearby water source instead of the air.
Some other impressive benefits of an air to water heat pump include theirenergy efficiency levels of up to 400%, theircost-effective operation, and the fact that they can help youlower your carbon footprint.
How does an air to water heat pump work?
Air to water heat pumps take heat from the outside air and transfer it to a wet central heating system, usually through radiators or underfloor heating. The created heat can be used for space heating or as a hot water supply for the house.
The inner workings of an air to water heat pump can be complicated but, in essence, they can be summarised in the following steps:
- The outdoor unit absorbs heat from the air outside. This air is then transferred to a coolant inside the system. That is, unless you have amonobloc heat pump, which operates from a single outdoor unit.
- To further increase the temperature of the coolant, a compressor comes into play.
- Once the coolant is sufficiently heated, it passes through a heat exchanger, where it releases its heat to a hot water reserve tank.
- This hot water is then circulated through pipes, supplying warmth to radiators and faucets.
- As the hot water is utilised, it returns to the reserve tank as cold water.
- Subsequently, the coolant is cooled down by the cold water and transferred back to the outdoor unit. Then, the process can start all over again.
With this continuous cycle, the air to water heat pump efficiently provides the necessary warmth to keep your home cosy and comfortable.
How efficient are air to water heat pumps?
An air to water heat pump is highly efficient. It has efficiency ratings ranging from 200%-400%, which means that it has aCoefficient of Performance (COP) of 2 to 4. This means that it can produce up to 4 times the amount of energy that it uses.
The efficiency of your air to water heating system is crucial, as it has a direct impact on how much you can save on your energy bills in the long run. That's why, when choosing an air to water heat pump, it's important to consider the question: "Do heat pumps work in cold weather?" The short answer is yes, although you may notice a drop in the efficiency of your heat pump in below freezing temperatures.
To make the most of an efficient air to water heat pump system, you will need to make sure that your home is properly insulated. This way, the energy that your appliance produces efficiently isn't wasted. If you want to learn more about the heat pump efficiency, you can check out the video below:
Air to water heat pump costs and savings
Air to water heat pumps cost around£8,000 – £15,000, excluding installation. For a better overview of the costs involved in installing an air to water heat pump, you can consult the table below with factors like household sizes andheat pump sizes:
| Household Size | Heat Pump Size | Estimated Heat Pump Cost | Estimated Installation Costs |
|---|---|---|---|
| 1 bedroom | 6kW | £8,500 | £350 - £1,700 |
| 2-3 bedrooms | 13kW | £13,000 | £350 - £1,700 |
| 4+ bedrooms | 16kW | £16,500 | £350 - £1,700 |
The figures listed above are estimates that don’t factor in other adjustments to your heating system, such as thecosts of underfloor heating or making changes to yourradiators. Make sure to keep these elements in mind when you’re trying to calculate the total costs of an air to water heat pump installation.
As far as air to water heat pump running costs go, these will vary depending on your household’s energy needs and the efficiency of your appliance. However, it's good to know that generallyheat pump vs gas boiler running costs are lower, so you'll be noticing some savings on your yearly energy bills.
Below you can find an estimate of the yearly running costs you can expect for different household sizes:
| Household Size | Estimated Annual Energy Demand | Estimated Annual Running Costs |
|---|---|---|
| 1 bedroom | 8,000kWh | £760 |
| 2-3 bedrooms | 12,000kWh | £1,065 |
| 4+ bedrooms | 17,000kWh | £1,475 |
To make sure you get the most up-to-date information regarding supply and installation costs, you should consult multipleair source heat pump installers near you. However, looking for a reliable professional on your own can be a hassle. After hours of tedious research, you might still come up empty-handed.
To avoid wasting your precious time and money, let us help youget started in just 30 seconds. Simply fill in our short form, and we’ll haveup to 4 local heat pump installersreach out to you with quotes for an air to water heat pump installation. You can then easily compare costs to secure the best deal for your home. Just click below torequest free, no-obligationair source heat pump quotes today!
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant
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Air to water heat pump grants
Currently, there are severalheat pump grant options available in the UK. These are:
- TheBoiler Upgrade Scheme (BUS): This scheme helps homeowners fund the upgrade of their home heating system with an air to water heat pump. With the BUS, you couldreceive up to £7,500 for an air to water heat pump installation.
- TheEnergy Company Obligation (ECO4): This scheme is designed to tackle fuel poverty and help reduce the UK’s carbon emissions. If you’re eligible, you could get up to 100% of the costs of your air to water heat pump covered. You may also be eligible to improve your loft, cavity, andwall insulation.
- 0% VAT: The VAT slash on clean energy solutions will continue in the UK until 2027 and it can allow homeowners to save on installation costs.
- Warmer Homes Scotland Scheme: This interest-free loan allows homeowners living in Scotland toreceive up to £10,000 to install an air to water heat pump.
- Home Energy Scotland Scheme: With this scheme, homeowners based in Scotland canreceive an interest-free loan of up to £15,000to install an air to water heat pump.
- Nest Scheme Wales: This allows households to benefit from having all the costs of anair source heat pump in Wales covered by the government.
Each of these grants has specific eligibility criteria that you must meet in order to apply. So, make sure to check whether you qualify for a grant to benefit from financial assistance towards installing an air to water heat pump.
Furthermore, many of these grants can be regionally dependent, so it's best to understand your area. Our grants page can give a good overview but we also have resources dedicated to heat pumps in Wales, heat pumps in Scotland andheat pumps in Northern Ireland.
Advantages and disadvantages of air to water heat pumps
While there are several advantages to an air to water heating system, there are also a few downsides to consider before moving forward with the installation process. You can find out more about the pros and cons of air to water heat pumps below.
Advantages of air to water heat pumps
- Cost-effective operation:Compared to other energy systems, air to water heat pumps can have lower running costs. This means that you’ll be able to avoid overspending on your energy bills with such an appliance.
- Reduced carbon emissions: Air to water heat pumps don’t burn natural gas to operate and they produce fewer carbon emissions than traditional home heating systems. They can also be paired withrenewable energy sources to run on clean electricity.
- Energy efficient: This system supplies your home with more energy than it consumes. Its efficiency rates can go up to 400%.
- Quiet operation:Air to waterheat pump noise levels are somewhere between 40 and 50dB, which is comparable to the noise made by a refrigerator or a gas boiler. So, overall, you shouldn't be able to notice the noise your heat pump makes as it's operating.
- Eligible for government grants: Because the UK government is pushing for more sustainable heating andgreen energy options, several grant opportunities have opened up for homeowners looking to install an air to water heat pump.
- Safe: Due to the fact that air to water heat pumps don’t produce carbon monoxide and don’t require gas to operate, they reduce the risk of gas leaks and other dangers, such as explosions.
For even more advantages, you can read our article:Are air source heat pumps worth it?
Disadvantages of air to water heat pumps
- High initial cost: The supply and installation costs of air to water heat pumps are quite high. This type has the highestair source heat pump cost. At the same time, even though you’ll be saving on running costs in the long run, the return on investment period is also fairly lengthy.
- Seasonal dependence: When operating in areas with temperatures below 0°C, air to water heat pumps can lose some of their efficiency.
- Requires quality house insulation: Without the proper insulation, your heat pump will be working overtime to warm up your home. So, if your home isn’t adequately insulated, you might need to make some adjustments before installing an air to water heat pump.
Is an air to water heat pump suitable for my home?
Installing air to water heating is a great option for households looking to lower their environmental impact and reduce the running costs of their energy system.Air source heat pump for flats is also a good option. While there are several benefits to such a heat pump, there are also some factors you should consider before moving forward with the installation process.
For instance, you need to make sure that your home is properly insulated and give some serious thought to your budget, as air to water heat pumps are quite expensive. If you do decide that you want to invest in such an energy source, you will undoubtedly want to avoid overspending on yourair source heat pump installation.
The best way to go about finding a good deal for your home is to compare the installation costs of several different installers. However, this is easier said than done. After hours or even days of tedious research, you might still be struggling to find the most up-to-date figures or a reliable installer.
Fortunately, we’re here to spare you any frustration. We’ve thoroughly vetted air to water heat pump installers operating across the country and can put you in touch withup to 4of them in no time. Justfill in our 30-second form and wait for the installers to get back to you withfree,non-binding quotes for their services.
Then, all that’s left is to do is compare figures and find the best deal for your new installation. Click below to get started now!
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant
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Frequently asked questions
Because ofhow it operates, an air to water heat pump does not guarantee constant hot water availability. To make sure that it’s the best option for your home, you should consult a heat pump installer who can offer you tailored advice based on your energy needs.
Yes, you can save money with an air to water heat pump. Your yearly savings could be anywhere between-£55 and £1,200 per year. However, exactly how much you will save will depend onseveral factors.
Yes, there are severalair to water heat pump grants available that you may be eligible for. For instance, you can check the eligibility requirements of the Boiler Upgrade Scheme if you live in England or Wales.
Air to water heat pumps last about10-15 years. Before committing to such an energy system, be sure to carefully weigh its against its long lifespan.
Air to water heat pumps work in the winter by extracting heat from the air outside and moving it inside. They work in reverse in the summer. The colder it is outside, the harder it is to extract heat. That’s why air to water heat pumps work optimally in moderate climates.
Valli has been writing well researched articles about renewable energy, sustainability and green technologies for GreenMatch since 2017. Her work has been published in various media such as Entrepreneur, Business Insider, Canadian Geographic, uSwitch, and eCycle.
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- Air to Water Heat Pump in the UK: Complete Guide (2026)
- What is an air to water heat pump?
- How efficient are air to water heat pumps?
- Air to water heat pump costs and savings
- Advantages and disadvantages of air to water heat pumps
- Is an air to water heat pump suitable for my home?
- Frequently asked questions