9 Best Air Source Heat Pumps in UK 2025

Last Updated on July 3, 2025

Looking for the best air source heat pumps in the UK in 2025? Whether you’re a UK homeowner, landlord, or business looking to cut down on energy bills and reduce your carbon footprint, selecting the right ASHP is crucial. 

To help you make an informed decision, we’ve reviewed the nine top-performing air source heat pumps available in 2025.

Here’s our quick pick of the best:

• Best Overall: Vaillant aroTHERM Plus
• Most Efficient: Ideal Logic Air
• Most Affordable: LG Therma V R290 Monobloc

9 Best Air Source Heat Pumps in the UK

1. Vaillant aroTHERM Plus (Best for: Overall Performance)

A hybrid-ready, highly efficient model suitable for most UK properties, offering excellent SCOP and ultra-quiet operation. It’s also a popular option for those exploring hybrid heat pumps that work alongside traditional boilers.

Specifications

Key Features

• Natural R290 refrigerant (future-ready)
• Sound power as low as 28 dB
• Works in outdoor temperatures as low as -25°C
• Compatible with hybrid heating systems

2. Ideal Logic Air – Most Efficient

The Ideal Logic Air surprises many with its exceptional SCOP of up to 4.9, making it one of the most efficient air source heat pumps in its class. It competes closely with other best heat pump brands despite its more affordable price.

Designed specifically for UK homes, this unit combines advanced performance with smart functionality, all at a competitive price point. This model also integrates well in retrofits, making it worth considering for those retrofitting an air source heat pump into older homes.

It’s a strong choice for landlords and homeowners who want top-tier efficiency without paying premium-brand prices. With MCS certification and BUS grant eligibility, it’s both a smart financial and environmental investment.

Specifications

Key Features:

• Market-leading SCOP for its price category
  
• Specifically designed for UK properties
  
• Compatible with existing radiators and heating systems
  
• Wi-Fi enabled and smart home compatible
  
• MCS certified and BUS grant eligible
  
• Compact, wall-hung design

3. LG Therma V R290 Monobloc – Best for Affordability

The LG Therma V R290 Monobloc delivers excellent performance at one of the most affordable price points on the UK market in 2025 and is particularly attractive for those evaluating the cost to replace a gas boiler with a heat pump. 

Designed with simplicity in mind, it offers an all-in-one outdoor unit that minimises installation time and costs making it ideal for homeowners and landlords seeking efficient, low-carbon heating without breaking the bank.

Despite its lower cost, the Therma V doesn’t compromise on efficiency or features. With a SCOP of up to 4.9, it competes with much pricier models, offering a reliable, quiet, and smart solution for a wide range of UK homes.

Specifications

Key Features

• Monobloc (all-in-one) outdoor unit for lower install costs
  
• Uses ultra-low GWP R290 refrigerant
  
• LG ThinQ Wi-Fi and smart control enabled
  
• Smart grid and solar PV integration
  
• Compact footprint with low visual impact
  
• MCS certified and BUS grant eligible

4. Panasonic Aquarea L – Best for Small Homes

The Panasonic Aquarea L is ideal for small UK homes thanks to its compact design and flexible installation options. It’s  well-suited for flats or terraced homes, especially where noise or space constraints for an ASHP is a concern.

Using the eco-friendly R290 refrigerant, it stands out as one of the most environmentally friendly and future-proof heat pumps available today. 

Its wall-mounted indoor unit option makes it perfect for properties with limited indoor space, such as flats, terraced houses, or smaller detached homes.

With a SCOP of up to 5.0, it combines energy efficiency with quiet operation, delivering reliable heating while reducing your carbon footprint.

Specifications

Key Features

• Uses ultra-low GWP R290 refrigerant
  
• Wall-mounted indoor unit ideal for limited space
  
• High water outlet temperatures (up to 75°C)
  
• Quiet operation suitable for urban environments
  
• Compatible with smart controls and solar PV systems

5. Hitachi Yutaki S80 – Best for High-Temperature Heating

Ideal for older properties with traditional radiators, especially if you’re wondering whether air source heat pumps work in old houses without replacing your heating system. The Hitachi Yutaki S80 delivers water temperatures up to 80°C—making it an excellent boiler replacement.

Specifications

Key Features

• Delivers 80°C water temp
  
• Suitable for radiator systems
  
• Can operate down to -20°C
  
• Quiet inverter compressor
  
• Easy to retrofit

6. Viessmann Vitocal 150-A / 200-A – Best for Hybrid Flexibility

This system is ideal for properties transitioning from fossil fuels, thanks to its hybrid-friendly design and compact, all-electric setup.

Specifications

Key Features

• Built-in hybrid integration options
  
• R32 refrigerant
  
• Operates in cold temps
  
• Sleek, compact outdoor unit
  
• Smart controls & app connectivity

7. Worcester Bosch Compress 2000 / 5800 AWF – Best for Brand Trust

From one of the UK’s most trusted heating brands, this Bosch system offers robust performance, brand reputation, and excellent service availability. While not the most efficient in the lineup, it still performs well and is especially relevant for anyone comparing gas boilers and air source heat pumps from a reliability standpoint.

Specifications

Key Features

• Quiet Mark certified
  
• 100% Bosch components
  
• Wireless & app control
  
• Sleek German design
  
• Compatible with existing radiators

8. Aira Heat Pump – Best for Warranty

The Aira Heat Pump, developed by a next-generation Swedish energy company, offers UK homeowners one of the most comprehensive warranties in the industry.

With a 10-year full system warranty covering parts, labour, remote diagnostics, and performance monitoring, it provides unmatched peace of mind for those making the switch to low-carbon heating. Its low-maintenance design with remote diagnostics is appealing to those who worry about heat pump running costs and long-term upkeep.

While its performance is excellent, boasting a SCOP of up to 5.6, what really sets Aira apart is its long-term commitment to customer support and system reliability.

Specifications

Key Features

• 10-year full system warranty (parts, labour, servicing)
  
• AI-powered energy optimisation
  
• Remote diagnostics & real-time support
  
• Designed for full electrification of homes
  
• Ultra-quiet outdoor operation
  
• Compatible with Aira’s end-to-end subscription or upfront purchase

9. Daikin Altherma 3 H HT – Best for Cold Climates

The Daikin Altherma 3 H HT is engineered to deliver outstanding heating performance even in the coldest UK winters. With advanced inverter technology and robust components, it can efficiently provide high-temperature heating down to outdoor temperatures as low as -25°C.

This makes it an excellent choice for homeowners and landlords in northern or rural areas where cold spells are common, or for properties with larger heating demands. 

Its ability to deliver water temperatures up to 70°C means it works seamlessly with existing radiators, avoiding costly replacements. 

If you’re concerned about whether heat pumps work in cold weather, this unit proves they can deliver strong performance even in freezing conditions. It’s also suitable for properties that rely on high-temperature heating like those switching from an oil boiler to a heat pump.

Specifications

Key Features

• Reliable operation in outdoor temps as low as -25°C
  
• High water flow temperatures (up to 70°C) suitable for radiators
  
• Ultra-quiet operation (as low as 35 dB)
  
• Compatible with smart controls and home automation
  
• Uses low-GWP R-32 refrigerant
  
• Flexible installation options (split system with indoor and outdoor units)

How Did We Choose the Best Air Source Heat Pumps?

Our selection is based on a combination of real-world performance, expert reviews, user feedback, manufacturer reliability, and future-proofing features.

Here’s what we considered as industry experts:

• Seasonal Coefficient of Performance (SCOP): Indicates real-world efficiency. Higher = better.
  
• Cold Climate Performance: Units must perform well even in UK winters, especially in properties that may be considering a high temperature heat pump to avoid radiator upgrades.
  
• Noise Levels: Especially important in urban areas or terraced housing. If you’re concerned, you’ll want to assess how noisy air source heat pumps are in real-world settings.
  
• Warranty & Aftercare: Longer warranties = more peace of mind.
  
• Installer Network & Support: Availability of parts and support is crucial.
  
• Grant Eligibility: Models that qualify for Boiler Upgrade Scheme (BUS) are prioritised.
  
• Refrigerant Type: Lower GWP refrigerants like R290 are preferred for sustainability.
  

We prioritised systems that deliver a balance between performance, price, and practicality ensuring homeowners get maximum return on investment.

How Do You Choose the Best Air Source Heat Pump for Your Property?

Every property is different. Choosing the best air source heat pump depends on your building type, insulation level, existing heating system, and usage habits.

Here’s what to keep in mind:

• Property Size & Heat Demand: Larger homes or poorly insulated properties will need higher-output units. Understanding what size air source heat pump you need can avoid overspending or underperformance.
  
• Noise Restrictions: Check decibel ratings if you’re in a dense residential area.
  
• Space Requirements: Monobloc units save space but may be louder; split units are quieter but take up more room inside.
  
• Budget & ROI: Consider lifetime costs, not just installation. Consider long-term savings, especially if you’re comparing options like heat pumps vs electric radiators or even an air source heat pump vs air conditioner. Efficient units save more long term.
  
• Radiator Compatibility: For homes with older systems, understanding whether heat pumps work with radiators can help avoid costly upgrades.
  
• Grants & Funding: Ensure your unit qualifies for the Boiler Upgrade Scheme (BUS) to save up to £7,500.
  

Even if you’re still unsure whether your house is suitable for a heat pump, an expert installer can guide you through every consideration, from grant eligibility to system compatibility.

Need help deciding? Get a personalised quote and assessment from a trusted heat pump installer like Eco Happy.

Want to Slash Energy Bills? Get a Free Air Source Heat Pump Quote Today

Thinking of upgrading your heating system? Whether you’re a homeowner, landlord, or business owner, investing in one of the best air source heat pumps could be your smartest move in 2025.

Get a free, no-obligation quote from Eco Happy today and find out if you qualify for a £7,500 government grant under the BUS scheme.