Best Air Source Heat Pump Brands UK 2026: 10 Top Manufacturers Compared

Choosing the right air source heat pump brand is one of the most important decisions when switching to low-carbon heating. The brand determines your system’s efficiency (and therefore running costs), noise levels, warranty protection, and how well it performs in cold weather. We’ve compared 10 leading ASHP manufacturers available in the UK, scoring each on efficiency (SCOP), price, warranty, noise, and customer service – with honest assessments including Trustpilot ratings that lead-gen competitors don’t show you.

Full Brand Comparison Table

Supply-only prices range from £2,500 (Grant) to £10,000 (Grant/Nibe, at the top of their ranges). All 10 brands are MCS-approved and eligible for the £7,500 BUS grant.

The best air source heat pump brands in the UK include Vaillant, Daikin, Mitsubishi, Grant, Samsung, and Bosch, with supply-only prices ranging from £2,500 for a Grant Aerona to £10,000 for Grant’s or Nibe’s largest models. All ten brands compared in this guide are MCS-certified and eligible for the £7,500 Boiler Upgrade Scheme grant, which can reduce the typical installed cost of £8,000 to £15,000 by almost half.

Efficiency ratings measured by Seasonal Coefficient of Performance range from 3.5 to 5.41 across the brands compared here, meaning the best units produce three-and-a-half to five-and-a-half kilowatt-hours of heat for every kilowatt-hour of electricity consumed. When choosing a brand, the most important factors are the property size, insulation level, existing heating system, and whether the unit will also provide hot water. Noise output varies significantly between brands, from 32 decibels to 54 decibels at one metre distance among the units with a published rating.

All prices are supply-only (unit, not installed). Add £3,500-£6,000 for installation labour. All brands listed are MCS-approved and eligible for the BUS grant (£7,500 for air-to-water systems). Check our full guide to heat pump grants for eligibility requirements and how to apply.

The 10 Best Air Source Heat Pump Brands UK (2026)

Our top 10 ASHP brands for UK homes are Vaillant, Daikin, Mitsubishi, Worcester Bosch, Grant, Samsung, Nibe, LG, Hitachi, and Panasonic – ranked by efficiency, price, and reliability.

The Vaillant aroTHERM Plus is a monobloc air-to-water heat pump available in 3.5, 5, 7, 10, and 12 kW sizes – see our sizing guide to work out which you need. It uses R290 (propane) refrigerant with a global warming potential of just 3 – the lowest of any brand on this list. Vaillant is a German manufacturer founded in 1874 (over 150 years of history) and consistently ranks among the top-rated heating brands in the UK.

With an SCOP of 5.03 at 35°C flow temperature, the aroTHERM Plus delivers more heat per unit of electricity than any competitor. It operates down to −25°C and can deliver flow temperatures up to 75°C, making it suitable for both underfloor heating and existing radiator systems. The unit carries Quiet Mark approval (54 dB sound power) and won the Green Home Awards in 2021.

Daikin is the world’s largest HVAC manufacturer, and the Altherma 3 range is their flagship heat pump for the UK market. The standard Altherma 3 H covers most homes, while the HT (High Temperature) model delivers 70°C flow even at −15°C outside – making it ideal for older homes with existing radiators that need high-temp water. The HT F variant operates down to −28°C, the best cold-weather performance of any brand we tested.

The Altherma 3 achieves a maximum COP of 5.43 (the highest peak efficiency on this list), though its seasonal SCOP varies more by model and temperature than Vaillant. Daikin offers a 5-year standard warranty (extendable to 7 via certified installer) and has one of the UK’s largest installer networks. Integration with solar PV panels via Daikin’s smart controller is a strong selling point for homes already generating their own electricity.

The Mitsubishi Ecodan is the most-installed heat pump brand in the UK, with over 15 years of proven track record. The new R290 Monobloc range (launched April 2025) comes in 5, 6, 8.5, 10, and 12 kW sizes, while the PUZ-WZ Ultra Quiet model achieves just 45-48 dB – one of the quietest on the market. Mitsubishi’s extensive UK installer network means you’ll find certified engineers in most areas.

The Ecodan delivers up to COP 4.9 and flow temperatures up to 75°C. The 7-year warranty is available through Ecodan Business Solutions Partners, though the standard warranty is only 3 years (shorter than Daikin’s 5). Customer service runs entirely through installers, not directly – which can be frustrating if you have post-installation issues.

Worcester Bosch is the UK’s most recognised heating brand, holding a Royal Warrant and over 60 years in the market. Their Compress range includes three models: the 5800i AW (their quietest, R290, 4-7 kW), the 7400i AW (semi-monobloc, 5-17 kW), and the 2000AWF (widest range at 4-30 kW). The 7400i achieves an SCOP of 4.99 at 35°C and has Quiet Mark certification.

Worcester Bosch’s greatest strength is customer service and brand trust – their 4.6/5 Trustpilot rating reflects a genuine commitment to aftercare. Extended warranties of up to 12 years are available through Worcester Accredited Installers. A £500 clean heat cashback is available for MCS-accredited installations (April 2026-March 2027). The hybrid option integrates with existing Bosch gas boilers for a gradual transition.

The Grant Aerona3 is an Irish/UK-focused brand that undercuts the Japanese and German manufacturers by £1,500-£2,000 on installed price. Available in 6, 10, 13, and 17 kW sizes, the 13 kW model achieves an SCOP of 5.41 at 35°C – actually the highest seasonal efficiency of any single model on this list, despite the budget positioning.

After the £7,500 BUS grant, the net cost of a Grant Aerona3 installation can be as low as £1,000 for smaller systems – making it the most affordable route to a heat pump. Grant holds Quiet Mark approval, A+++ energy rating, and compatibility with existing radiator systems. The 7-year extended warranty requires a G1 Certified Installer.

Samsung’s EHS Mono HT Quiet is the quietest air source heat pump on the UK market at 35 dB – roughly the volume of a library or a quiet whisper. It’s Quiet Mark certified and available in 9-16 kW sizes. The unit delivers 70°C flow temperature (suitable for existing radiators without upgrades) and integrates with Samsung’s SmartThings app for remote monitoring and scheduling.

However, Samsung’s heat pump division has a significant customer service problem. With a 1.2/5 Trustpilot rating, warranty claims and aftersales support are widely criticised. The technology is excellent, but be prepared for potential frustrations if anything goes wrong. The Gen 7 R290 model (newer) uses eco-friendly refrigerant, while older models use R32.

Nibe is a Swedish manufacturer with 70+ years of heat pump experience. The F2040 suits 2-3 bed homes (3.7-12 kW), while the F2050 targets larger properties (5-20 kW) and features smart accessories via the myUplink app. Nibe’s adaptive intelligence adjusts output based on your home’s energy patterns, and the F2050 supports cascade configuration for very large buildings.

Nibe’s standout advantage is warranty length: up to 10 years via approved installers, the longest available. SCOP of 5.0 at 35°C is competitive with Vaillant. The downside is a minimum 8 kW output on the F2050, which excludes smaller properties, and a limited pool of approved repair partners outside major cities.

LG’s Therma V R32 Monobloc S is a compact, lightweight unit available in 5-16 kW. Some models achieve noise levels as low as 32 dB – even quieter than Samsung’s headline 35 dB. LG was an early adopter of R32 refrigerant, and the Monobloc S design eliminates the need for indoor pipe connections, simplifying installation. COP reaches up to 5.2 on the best models.

LG occupies the mid-range on price (£3,340-£6,400 supply), making it a good balance of performance and value. The 3-year standard warranty is average (7 via LG-trained installer), and the diagnostic interface is praised by engineers. Customer service reviews are mixed but significantly better than Samsung or Hitachi.

The Hitachi Yutaki range covers the widest output range of any manufacturer: 4.3-24 kW across the Yutaki M (monobloc), Yutaki S (split), and Yutaki S Combi (with integrated 180L cylinder). The S80 model uniquely delivers domestic hot water at 80°C – high enough to work with existing uninsulated pipework in older properties. COP reaches up to 5.25.

Hitachi’s 5-year standard warranty is better than Vaillant or Worcester Bosch at base level. However, like Samsung, customer service is a serious weak point – Trustpilot shows 1.3/5 with frequent complaints about warranty claim handling. If you need 16 kW+ output for a large or poorly insulated home, Hitachi is one of very few options.

Panasonic’s Aquarea range offers the lowest entry price on this list, with supply-only costs from £675 for smaller units. The L series handles most UK homes (2-9 kW), while the T-Cap model maintains full capacity down to −20°C without the efficiency drop that affects standard compressors. COP reaches up to 5.28 on optimum models.

Panasonic is a solid budget choice for small homes and retrofit projects where price is the primary concern. The 3-year standard warranty (7 via trained installer) is average, and the brand lacks the premium features and installer network of Vaillant or Daikin. For a 1-2 bed home after the BUS grant, Panasonic delivers the lowest out-of-pocket cost.

How Do Air Source Heat Pumps Work?

Air source heat pumps work by extracting heat from the outside air and concentrating it through a refrigerant cycle to heat your home and your hot water. There is usable heat energy in the air even below freezing; the compressor raises it to a useful temperature and the system delivers it through radiators or underfloor heating.

Efficiency is measured by the Seasonal Coefficient of Performance (SCOP). The brands in this guide span 3.5 to 5.41, which means every kilowatt of electricity produces 3.5-5.4 kilowatts of heat. Because heat pump technology runs at a lower temperature than a gas boiler, homes with good insulation and correctly sized radiators get the most efficient heat – the unit matters less than the design of the heat pump system around it.

Types of Heat Pump: Air-to-Water, Air-to-Air and Ground Source

Every unit in this guide is an air-to-water heat pump – the type of heat pump that heats radiators and a hot water cylinder, and what most UK buyers mean by ASHP. Air-to-water systems qualify for the full £7,500 Boiler Upgrade Scheme grant.

An air-to-air heat pump instead blows warm air straight into rooms, like an air conditioning unit running in reverse. It is cheaper to install but cannot heat water, and it attracts a lower £2,500 BUS grant. A ground source heat pump extracts heat from buried collector loops rather than the outside air – more efficient in deep winter, but the groundworks push installation costs well above air source, with the same £7,500 grant available.

Air Source Heat Pump Installation: Costs and What to Check

A full air source heat pump installation costs £7,000-£9,000 for a 1-2-bed home (5-7kW unit), £9,000-£12,000 for a 3-bed semi (7-9kW), and £11,000-£16,500 for a 4-bed detached (10-16kW) before the grant. Heat pump installations are zero-rated for VAT until March 2027, so these are the prices you pay.

To claim the BUS grant you must use an MCS-certified heat pump installer, and the system must be commissioned within 120 days of the grant application – so check certification before you sign, not after. Your survey may also flag extras that sit outside the headline quote: radiator upgrades run £3,600-£9,000 if needed, and a new hot water cylinder £500-£1,500. The best value for money comes from a correctly sized unit and honest survey, not the biggest brand name.

How to Choose the Best Heat Pump Brand for Your Home

The best brand depends on your property type, budget, and priorities. Older homes with existing radiators need high-temp models (Daikin HT, Samsung, Hitachi). Budget buyers should consider Grant. Cold-climate homes in Scotland benefit from Daikin’s −28°C capability. Still deciding whether a heat pump is the right move? Our guide on whether heat pumps are worth it breaks down the financial case. You can also compare all heat pump options on our hub page.

Best for Older Houses with Existing Radiators

Older homes typically have radiators designed for 60-80°C flow temperatures from a gas boiler. Standard heat pumps operate at 35-45°C, which means you may need to upgrade radiators unless you choose a high-temperature model. The best options are:

• Daikin Altherma 3 HT – 70°C at −15°C (best for northern UK)
• Samsung EHS Mono HT Quiet – 70°C (quietest high-temp option)
• Hitachi Yutaki S80 – 80°C DHW (works with uninsulated pipes)
• Vaillant aroTHERM Plus – 75°C max flow

Best for Cold Climates (Scotland, Northern UK, Exposed Sites)

Cold-weather performance matters most if your property regularly sees sub-zero ambient temperatures or if you’ll rely on the heat pump for the bulk of your winter heating. The headline number to look at is the minimum operating temperature – the outside temperature below which the unit shuts down.

• Daikin Altherma 3 HT F – operates at −28°C (best available)
• Vaillant, Mitsubishi, Samsung, Nibe, Grant, Hitachi – all operate at −25°C
• Panasonic Aquarea T-Cap – maintains rated capacity at −20°C (capacity retention, not just operation)

However, the minimum operating temperature is only part of the story. Two practical factors matter more for real-world cold-weather efficiency:

• Capacity retention – most ASHPs are rated at 7°C ambient (the EN 14825 standard rating point). As ambient drops, output capacity drops too. Panasonic’s T-Cap technology and similar variable-speed designs hold rated capacity further down the temperature curve, which means a 7kW T-Cap delivers closer to 7kW at −15°C than a standard 7kW unit would. If you’re sizing for a Highlands winter rather than a London one, ask the installer for the unit’s capacity at −7°C, not just the rated capacity.
• Defrost cycle frequency – in damp UK winters between 0°C and +5°C ambient, frost builds on the outdoor coil and the unit must reverse-cycle to defrost it. Each defrost cycle costs efficiency. Brands with larger surface-area coils and smarter defrost-on-demand controls (Daikin HT, Mitsubishi Ecodan, Vaillant aroTHERM Plus) generally manage this better than budget alternatives, though no manufacturer publishes comparative defrost data so it’s hard to benchmark on paper.

For Scottish or exposed sites, prioritise the Daikin Altherma 3 HT F (lowest operating floor and a 70°C high-temp variant for older radiators) or the Panasonic Aquarea T-Cap (best capacity retention). Both Vaillant aroTHERM Plus and Mitsubishi Ecodan are reliable second-tier choices – their −25°C operating floor is sufficient for the vast majority of UK postcodes.

For specifying a system in any genuinely cold location, request a heat-loss survey that uses your local design temperature (often −3°C in southern UK, down to −7°C or lower in the Highlands) rather than the rated capacity at 7°C ambient. The capacity figure on the manufacturer’s spec sheet assumes mild conditions, not your actual coldest design day.

Best for Flats and Compact Outdoor Spaces

Flats, terraces with shared courtyards, and properties with restricted outdoor space face two extra constraints: noise to neighbours, and the physical footprint of the outdoor unit. The smallest 3.5-5kW models (suitable for well-insulated 1- or 2-bed flats) typically need a 0.6-0.8m clearance on three sides plus airflow access. Three brands stand out for tight installs:

• Samsung EHS Mono HT Quiet – 35 dB at low fan speed makes it the obvious pick where neighbour noise is the binding constraint. 70°C flow temperature also makes it suitable for older flat conversions with existing radiators.
• Vaillant aroTHERM Plus 3.5kW or 5kW – same compact outdoor unit shared between the two outputs (software-limited), so the 5kW gives you headroom without an upsized footprint.
• Mitsubishi Ecodan – lower starting outputs (4.5kW) and well-regarded inverter modulation make it a fit for thermally efficient newer flats where heat demand is genuinely small.

For leasehold flats, check your lease and management-company rules before committing to a quote – many require freeholder consent for an external unit, and listed conservation areas may need additional planning permission.

Best Net Cost After BUS Grant

This comparison is completely absent from competitor guides but it’s the number most buyers actually care about. Here’s what you’ll actually pay out of pocket for a 3-bed semi (8-10 kW system) after the £7,500 grant:

All figures include 0% VAT (current until March 2027) and assume a standard installation without major additional works.

Customer Service and Warranty Comparison

Worcester Bosch and Vaillant lead on customer satisfaction (both 4.6/5 Trustpilot). Samsung (1.2/5) and Hitachi (1.3/5) have severe service problems that potential buyers should consider carefully.

We’ve included Trustpilot ratings because they tell a story that lead-generation websites won’t. Samsung and Hitachi make technically capable heat pumps, but their aftercare track record means you’re taking a service risk. If warranty support matters to you (and it should on a 20-year investment), Worcester Bosch, Vaillant, and Mitsubishi are the safest choices.

• Always check that your installer – is an authorised dealer for the brand they recommend
• Extended warranties are only valid through certified – installers, and this also ensures access to manufacturer-backed parts and support
• Get at least 3 quotes from MCS-certified – installers to compare brands, prices, and warranty terms for your specific property

Laura Bennet

Home Energy & Sustainability Editor

Laura leads coverage on home energy, heating, and sustainable living. With over 12 years in the UK energy sector, she writes about boilers, solar panels, insulation, and eco-friendly upgrades that reduce household costs.

Reviewed by

Tom Reynolds

Business Energy Specialist