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Best Air Source Heat Pumps in the UK (2025)
- The best overall air source heat pump in the UK in 2025 is the Viessmann Vitocal.
- Ideal Logic Air is the most efficient heat pump on the market.
- LG’s Therma line is the most affordable option for the average household.
When choosing an air source heat pump, it's crucial to consider various factors such as cost, efficiency, power, performance, heat pump size, warranty, availability with heat pump installers in the UK, and the size of your home. We’ve considered all these points when compiling our comprehensive guide to the best air source heat pump options on the market.
The cost of high-quality air source heat pumps ranges anywhere from £2,655 to £12,000, so they can be a significant investment. The best air source heat pumps available in the UK are:
| Heat Pump Model | Category | Greenmatch Rating |
|---|---|---|
| Viessmann Vitocal | Best overall | 4.62 |
| Panasonic Aquarea L | Best for small homes | 4.12 |
| Vaillant aroTHERM | Best for high temperatures | 4.5 |
| LG Therma V | Most affordable | 4.25 |
| Aira Heat Pump | Best warranty | 4 |
| Daikin Altherma 3H HT | Best for colder regions | 4.37 |
| Ideal Logic Air | Most efficient | 4.12 |
| Hitachi Yutaki | Most powerful | 4.25 |
We’ve carefully selected these air source heat pumps to help you find the appliance that best suits your specific needs. We looked over the most popular brands and compared their offers in terms of price, heat pump efficiency, range of outputs, noise levels, and features such as water tank options, additional units, and types of refrigerant.
Additionally, if you decide to install an air source heat pump, we can help you get the process started in no time. Do you want to avoid spending several hours researching, calling installers, and collecting quotes yourself? Then simply click below, fill in our 30-second form, and we will send you up to 4 free heat pump quotes from certified installers in your area.
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- Payment by finance available
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- Best Air Source Heat Pumps in the UK (2025)
- The best air source heat pump: Review process
- Best overall - Viessmann Vitocal
- Best for small homes - Panasonic Aquarea L Series
- Best for high temperature - Vaillant aroTHERM
- Most affordable - LG THERMA V
- Best warranty - Aira Heat Pump
- Best in the cold - Daikin Altherma 3
- Most energy efficient - Ideal Logic Air
- Most powerful - Hitachi Yutaki
- How did we come up with our GreenMatch rating?
- Best air source heat pump brand in 2025
- Which air source heat pump is the best fit for your home?
- FAQ
The best air source heat pump: Review process
To determine which air source heat pump is the best, we looked at the following metrics:
- Price: Heat pumps are a big investment, which is why finding one with a reasonable price is extra important. The heat pumps on our list have a price range of £2,800 - £15,000.
- Efficiency: How much it costs to generate warmth and cooling is an important measure of whether a heat pump will be worth it. We looked at the coefficient of performance CoP and seasonal coefficient of performance (SCoP) to filter the best heat pumps.
- Operating temperatures: How high temperature the system operates can be important for homes with higher heating needs, while how low a temperature the heat pump can operate at can be a good measure of how well it deals with colder environments. This list features heat pumps with a minimum flow temperature of -28°C to -7°C and maximum flow temperatures of 55°C to 80°C.
- Extra features: Additional features like good connectivity, smart controls, low-noise operation, and more sustainable refrigerants can be important for some buyers.
- Reviews: Reviews are a good indicator that a heat pump is worth investing in. We looked at reviews from various heating information outlets.
After analysing and reviewing several models, we put together the following list of the best heat pumps this year by the best air source heat pump manufacturers. Whilst it doesn’t include all the available options, it can definitely help you find out which heat pumps are currently the best in the UK.
Here are our 8 picks for the best air source heat pump models.
Best overall - Viessmann Vitocal
The Vitocal air source heat pump range tops this list as it offers great performance, efficiency and a wide range of outputs. This range consists of compact monobloc models (requires 60% less space compared to other brands). You can also combine an air source heat pump from this range with a boiler to cover your home’s heating demands and improve the efficiency of your central heating system. With its A+++ ErP efficiency rating this is a great option for an efficient heating system with minimal noise.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 2.1kW - 14.9kW | A+++ | 5 | £5,620 - £11,375 | 2 - 7 years |
Some additional features of the Viessmann Vitocal are:
- All units in the range have advanced acoustic designs for quiet running. The noise levels for different models range from 30dB(A) to 56dB(A).
- The models in this range include Vitocal 150-A, Vitocal 151-A, Vitocal 200-A, Vitocal 222-A, Vitocal 300-A and Vitocal 350-A.
- Some units use modern refrigerants such as R32 and R290 for heating, which are more environmentally friendly than other refrigerants, reducing carbon emissions.
- 70°C water flow temperature at an outside temperature of -10°C.
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
 |
 |
4.62 |
- High energy efficiency: The high CoP and SCoP translate to lower energy bills and long-term savings.
- Diverse output range: The Vitocal 100-A, 150-A, 151-A, 200-A, and 222-A monobloc units are space-saving units suitable for small houses. While Vitocal 200-A Pro and 250-A Pro are ideal for commercial use.
- Suitable for new builds and retrofits: The Vitocal range can be installed in both new buildings and be retrofitted into existing heating systems.
- High initial costs: The upfront costs can be comparatively high.
- Yearly maintenance: Annual servicing is recommended to avoid any potential system errors.
- Performance issues in extreme cold: Below -10°C the heat pump might struggle to function properly.
Best for small homes - Panasonic Aquarea L Series
This new generation of Aquarea Panasonic heat pumps is highly reliable even at low temperatures and can perfectly complement your home if you choose an indoor or outdoor unit. The L generation is part of the Panasonic High Performace range, which includes bi-bloc and split heat pumps.
This range won the Reddot award and the IF Design award in 2023 for its user-centric functionality and remarkable performance. However, this range has a lower power output capacity, which means that it might not be suitable for all homes. Yet, it can be one of the best and affordable air to water heat pump options for smaller homes in the UK.
If you want to take a detailed look at the heat pump specs, you can use this datasheet.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 5kW, 7kW, 9kW | A+++ | 5 | £3,430-£7,920 | 7 years |
A few other features of this heat pump are:
- Uses the natural refrigerant R290 for heating, which has a global warming potential of 3.
- Provides water outlet temperatures of up to 75°C and down to -10°C.
- Domestic hot water up to 65°C without a heater.
- Noise level of 52 db(A) to 63 db(A)m, ensuring quiet operation.
- Can integrate your Wi-Fi module into the indoor unit.
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
|
|
 |
4.12 |
- High energy efficiency: The Panasonic Aquarea series displays an excellent SCoP of up to 5.06, making it far more efficient than a lot of other heat pumps on the market.
- Connectivity options: Along with the easy Wi-Fi integration, the cloud connection allows installers to remotely configure the heat pump for better performance if needed.
- Suitable for retrofit applications: L-series is great for renovations. This series integrates better with pre-installed radiators.
- Great integration with underfloor heating: This air to water option is easy to incorporate with water-based appliances like underfloor heating.
- Low energy output: While it can be great for smaller homes, larger ones with high energy needs may need a high-power system.
- Limited output range: This line of models offers fewer output options, so meeting your exact needs may be difficult.
Best for high temperature - Vaillant aroTHERM
The aroTHERM air source heat pump range includes 2 types of outdoor units: the aroTHERM plus and the aroTHERM split. The former is a high-temperature air source heat pump that can be connected to an existing wet central heating system. The aroTHERM plus model can reach up to 75°C flow temperature, making it ideal for homes with high heating and hot water demands. For more information, see the datasheet for the aroTHERM plus.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 3.5kW, 5kW, 7kW, 10kW, 12kW, 15kW | A+++ | 5 | £3,786 – £6,082 | 2-7 years |
In addition to these characteristics, this air source heat pump also has the following features:
- The aroTHERM range includes high-temperature and low-temperature units.
- Monobloc and split units are available.
- Quiet Mark Certification with noise levels ranging from 30 dB(A) to 54 dB(A).
- Flow temperature of up to 75°C
- SCoP of up to 5.03
- Some units use the R290 refrigerant, which has a very low global warming potential.
- Indoor units with integrated hot water storage tanks are available.
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
 |
|
4.5 |
- Great temperature output: Built for homes with higher temperature needs, the AroTHERM is a great option. It can supply temperatures up to 75°C.
- Compatibility with renewables: Can be integrated with PV systems and smart power grids.
- Salt-resistant design: The salt-resistant construction C5 class makes it suitable for installations 150m away from the sea.
- The app can be difficult to use: Customers have reported difficulties with the ‘myVaillant’ app compatibility.
Most affordable - LG THERMA V
What sets this model apart from other air source heat pumps is its excellent price-quality ratio. The THERMA V range includes units that can operate in temperatures as low as -25°C and heat water to a maximum of 65°C.
On the other hand, the hot temperature heat pumps in the range can heat water up to 80°C. The heat pumps in this range come in split and monobloc options. The models in this range include THERMA R32 Monoboc S, THERMA R32 Split, THERMA High Temperature, and THERMA Hydrosplit. You can refer to this datasheet for more information about the Therma V specs.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 5kW, 7kW, 9kW, 12kW, 14kW, 16kW | A+++ | 2.70-4.50 | £2,655 – £4,550 | 3-5 years |
Some other characteristics of this air source heat pump include:
- Includes high-temperature pumps capable of heating water up to 80°C.
- Some units will still produce heat in outdoor temperatures as low as -25°C.
- Split system heat pump and monobloc units are available.
- Includes units which use the R32 refrigerant, a hydrofluorocarbon refrigerant with a global warming potential of 675.
All units require a separate hot water tank for domestic hot water making it less viable for combined underfloor heating air source heat pump systems.
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
 |
 |
4.25 |
- Affordable: This heat pump range is the cheapest on this list, with an average cost of £3602, making it an efficient, budget-friendly option for homeowners.
- Long lifespan: Consumers and reviews report a lifespan that can go up to 20 years with low degradation in quality.
- Great for medium sized houses: The heat pump is ideal for 2-3 bedroom homes looking for something with decent low-temperature operating.
- Customer service issues: Some customers have noted that LG’s response time to queries and issues is not ideal.
- Compatibility issues: It can be difficult to pair the heat pump with underfloor heating.
To get an accurate estimation of total costs for heat pump installation it is recommended to contact experienced professionals. You can either go through the hassle of scouring the internet for the best local installers and call them one by one or use GreenMatch’s easy service.
You can get up to 4 free and non-binding quotes from our network of trusted installers by just filling out a short 30-second form.
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- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant
Best warranty - Aira Heat Pump
Aira is a relatively new brand compared to the other brands on this list. The Aira heat pump has good energy efficiency and the best warranty (15 years). However, the 15-year warranty is tied to their all-inclusive subscription-based plan.
The subscription plan covers a maintenance visit every 2 years, customer support and premium app features. The Aira Indoor Unit Compact has an indoor unit, an outdoor unit, a hot water cylinder, and a buffer tank.
For more information about the Aira heat pump, you can use this datasheet.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 6kW, 8kW, 12kW | A+++ | 4-5 | £5,450-£12,000 | 15 years |
Here are some other notable features of this model:
- SCoP of 4.7.
- Uses natural R290 refrigerant.
- Maximum outlet temperature of 70°C and can operate in temperatures down to -25°C.
- Noise levels of 46 db(A) to 51db(A).
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
 |
|
4 |
- High energy efficiency: The high SCoP of 4.7 suggests good performance throughout different seasons.
- Great warranty: Aira has the best warranty compared to other brands.
- Subscription-based model: Instead of a direct sale, Aira offers its heat pumps on a subscription-based model with monthly payments.
- High upfront costs: Customers have raised concerns about the high upfront costs even after factoring in grants.
Best in the cold - Daikin Altherma 3
The Daikin Altherma 3 range consists of a low-temperature range (Altherma 3 R) and a high-temperature range (Altherma 3 H HT). Altherma 3 R air source heat pumps include monobloc and split models that are also compatible with low-temperature radiators and underfloor heating.
The Daikin Altherma is best for homes in colder regions, such as the Northern areas of the UK. It can operate at lower temperatures without losing much of its efficiency. More information about the models can be found here.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 4 - 18kW | A+++ | 4.5-5.12 | £4,141 – £6,142 | 3 - 7 years |
Additionally, this range is impressive because it can still generate heat in temperatures as low as -25°C, making it a great option for colder climates. Some other key characteristics of this heat pump include:
- The Altherma 3 range includes high-temperature and low-temperature pumps.
- Heat is still generated in outdoor temperatures as low as -25°C.
- Includes units compatible with solar power.
- All units in the range use the R32 refrigerant.
- Includes both split and monobloc units.
- Indoor units with integrated hot water storage tanks are available.
- Includes units with a low sound mode for minimal disturbance—43db(A) to 50db(A).
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
|
 |
4.37 |
- High and low-temperature options: Daikin’s product portfolio offers a variety of efficient systems for different environments and household sizes.
- Difficulty with maintenance: Customers have reported facing difficulty with heat pump maintenance, resolving performance issues and reaching customer service.
Most energy efficient - Ideal Logic Air
The Ideal Logic Air range features monobloc heat pumps with excellent energy efficiency. They are suitable for medium to large houses with moderate heating demands. The impressive SCoP of 5.19 means that for every unit of thermal/electrical energy input, it produces 5 times the heating.
There are many output sizes for homeowners to choose from depending on their heating needs— 4kW, 5kW, 8kW and 10kW. More information about the model’s specs can be found in this datasheet.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 4kW, 5kW, 8kW, 10kW | A+++ | 3-5.34 | £3,200-£4,304 | 2-5 years |
In addition to these characteristics, this air source heat pump also has the following features:
- SCOP of up to 5.19 depending on different conditions.
- Uses R32 refrigerant.
- Quiet Mark Approved as noise levels are 52db(A) to 55db(A).
- Monobloc technology enables easy installation and servicing.
- Maximum flow temperature of 55°C at 7°C.
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
 |
 |
4.12 |
- High energy efficiency: The SCOP is 5.04 when the pump is running at 35°C and 3.96 when it is running at 50°C. This makes it the most efficient heat pump on this list.
- Affordable: The models are priced competitively, making them attractive for buyers looking for efficient models on a budget.
- Compatibility with renewables: Apart from integrating with underfloor heating systems, this model is also compatible with solar PV and smart grid systems.
- Not suitable for high temperatures: The maximum temperature for this model is 55°C. Therefore it is not suitable for high heating demands.
Most powerful - Hitachi Yutaki
Hitachi’s Yutaki range combines energy efficiency with a vast output range. This range has the best heat pump in terms of power output capacities, which range from 4.3 to 24kW. The compact models are easy to install and the larger models are adept for large heating and hot water demands.
The air to water Hitachi heat pumps are great for homes that need more power to meet their energy needs. Therefore, they can be ideal for homes that experience vast temperature changes. More information about the models and specs can be found here.
| Available Outputs | Efficiency rating | CoP | Estimated cost | Warranty |
|---|---|---|---|---|
| 4.3 - 24kW | A+++ | 4.6 | £2,500 – £8,220 | 5 years |
A few other key features of this air source heat pump are:
- The Yutaki range includes units capable of heating water up to 80°C.
- All units operate at temperatures as low as -15°C, with some operating at -25°C.
- Indoor units with integrated hot water tanks are available.
- All outdoor units have an exclusive smart defrost cycle, which improves energy efficiency.
| Output | Efficiency | Warranty | Price | GreenMatch Rating |
|---|---|---|---|---|
 |
 |
 |
 |
4.25 |
- Compact dimensions: The heat pump won’t take up much space once installed. This can be great for smaller homes with less outdoor space.
- Easy to use and install: The setup wizard takes 5 minutes to get going and is easy to use. The heat pump parts are self-contained, so it is also easy to manage
- High upfront costs: Hitachi technologies can be more expensive, even for lower-output heat pumps. There are cheaper systems within the same power range.
If you’re looking for the best deals on heat pumps, you’re in luck! Secure the best deal on your new air source heat pump with our network of vetted installers by filling in a short 30-second form. Simply click below and request 4 free, no-obligation quotes today!
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How did we come up with our GreenMatch rating?
When compiling our list of the best air source heat pumps in the UK today, we considered criteria such as each model's price-quality ratio, power output, efficiency levels, warranty periods, and air source heat pump reviews from professionals and customers.
Cost
Since air source heat pump costs can be quite high, the models we selected for our list have been chosen for their good price-quality ratio. This way, you can have the peace of mind that the air source heat pump you spent your money on will be a worthwhile addition to your home. In conjunction with power, this helps us determine the best value for money.
You can expect to pay between £4,000 to £6,500 for a high quality air source heat pump, but some great cheaper models are also available if you are on a budget.
Power
The power output of air source heat pumps is a crucial factor to consider when selecting an air source heat pump. All the models on our list of ‘best air source heat pumps’ have a wide range of power output capacities. We’ve selected these models to help you find the best one for you based on your home’s size and energy needs.
For the average 2 to 3 bedroom house, a 4kW or 5kW heat pump will work just fine. Homes with larger heating needs (multiple bedrooms, hot water outlets and radiators) may need something more powerful or colder regions may need a high-temperature model, so keep these factors in mind.
Efficiency
We’ve only selected air source heat pumps with high-efficiency ratings for our list. With ErP ratings ranging between A++ and A+++, these models are guaranteed to generate energy for your home without wasting the resources that they run on.
This means that you will be able to maximise the comfort of your home with any of the air source heat pump models we’ve listed. Energy efficient heat pumps can (typically) be more expensive, but they make up for it in energy bill savings. By investing in a heat pump in the UK, you can save up to £1,200 on your yearly heating bills.
Warranty
A good warranty period is important for any purchase you make. So, you’ll be glad to know that all the air source heat pumps on our list have great warranties, as most come with a 2-5 year warranty period. Considering that the lifespan of an air source heat pump is around 10-15 years, this means that your warranty can cover your appliance for about half of its life expectancy.
The warranty can also be indicative of the durability and lifespan of the heat pump. In this regard, a great lifespan can be anything over 15 years.
Reviews
We also considered air source heat pump reviews when making our selection of the best options in the UK today. Our choices were determined by how highly-regarded the heat pump manufacturers are and how reliable the models are reported to be by satisfied customers.
We also took into account additional features such as low-noise operation, connectivity, and types of refrigerant used. These all contribute to the quality of life and eco-friendly operation.
We made sure of quite a few important details before picking our finalists, such as ensuring popularity and availability. The brands we picked are well-known and can provide great service. The heat pumps they have are recognised as reliable by professionals and reviewers. They also have a wide reach across the UK, being provided by many installers.
Best air source heat pump brand in 2025
Our research indicates that Viessmann is the best heat pump brand in the UK based on its high energy efficiency, diverse output range, good warranty and performance.
| Viessmann Vitocal specs | |
|---|---|
| Available outputs | 2.1kW - 14.9kW |
| Efficiency rating | A+++ |
| Estimated cost | £5,620 - £11,375 |
| Warranty | 2 - 7 years |
The company’s heat pumps also integrate very well with existing systems and allow for multiple fuel sources. With an A+++ efficiency rating, they can ensure a decrease in energy consumption and heating costs with eco-friendly systems.
Viessmann products are also widely available, so it’s fairly easy to find a heat pump installer approved by the company, and you can get a 7-year warranty on your installation.
Which air source heat pump is the best fit for your home?
The best air source heat pumps for your home can vary based on your home size, budget, and heating needs. We recommend the Viessmann Vitocal, Panasonic Aquarea, LG Therma V, and Hitachi Yutaki, all for different reasons.
The Viessmann Vitocal provides the most balanced performance, but your needs may vary. For smaller homes, Panasonic Aquarea can be a great option, while larger homes may benefit from a higher power output system such as the Hitachi Yutaki. Colder homes may benefit from the Daikin Altherma with its superior heat output. Affordable options include the LG Therma V which is on the cheaper side but may not suit larger homes.
If costs still seem high, there are government programs that can help. Grants like the Boiler Upgrade Scheme can cut full installation costs by £7,500. We also have resources dedicated to heat pumps in Wales, heat pumps in Scotland, and heat pumps in Northern Ireland that you can go over for regional information.
Looking through air source heat pump reviews is a good start, but ultimately, you will need to talk to a professional who can advise you properly. If you're unsure whether a heat pump is really for you, we give you answers to a lot of your concerns in our article: Are air source heat pumps worth it?
However, if you have decided to install an air source heat pump in your house, we can help you. Instead of spending hours searching for local installers on your own and wasting your precious free time, you can fill out our short 30-second form. You’ll receive 4 free and non-binding quotes for a new air source heat pump.
Click below to start looking for the best air source heat pump for your home today!
- Quotes from local engineers
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FAQ
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- Best Air Source Heat Pumps in the UK (2025)
- The best air source heat pump: Review process
- Best overall - Viessmann Vitocal
- Best for small homes - Panasonic Aquarea L Series
- Best for high temperature - Vaillant aroTHERM
- Most affordable - LG THERMA V
- Best warranty - Aira Heat Pump
- Best in the cold - Daikin Altherma 3
- Most energy efficient - Ideal Logic Air
- Most powerful - Hitachi Yutaki
- How did we come up with our GreenMatch rating?
- Best air source heat pump brand in 2025
- Which air source heat pump is the best fit for your home?
- FAQ
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant