The short answer
Several established manufacturers sell air source heat pumps in the UK. The most commonly fitted brands include Daikin, Vaillant (Arotherm), Mitsubishi Electric (Ecodan), Samsung (EHS), Grant (Aerona) and Nibe — alongside others such as Panasonic, LG, Worcester Bosch and Stiebel Eltron. There is no single 'best' brand: each offers reliable units across a range of outputs, and most modern models reach a SCOP of around 3 to 4 and now use the lower-impact R290 refrigerant in newer ranges. What matters far more than the badge is correct sizing, system design and installation by an MCS-certified installer, plus parts availability, warranty terms and the installer's familiarity with that brand. A well-designed system from any reputable brand will outperform a poorly designed system from a 'better' one.
When you start getting quotes you will see a handful of recurring brand names. Here is a factual overview of the main ones and, more importantly, what actually determines whether your heat pump performs well.
Main UK heat pump brands
- Common brandsDaikin, Vaillant, Mitsubishi Ecodan, Samsung, Grant, Nibe
- Also widely availablePanasonic, LG, Worcester Bosch, Stiebel Eltron
- Typical SCOPAround 3.0 to 4.0
- Newer refrigerantR290 in many recent ranges
- What matters mostSizing, design and MCS install
The main brands, described factually
The following are among the most commonly installed air source heat pump brands in the UK. This is a descriptive overview, not a ranking — all are established manufacturers with units across a range of outputs.
- Daikin — a large global manufacturer with a broad domestic range (including the Altherma line) and a wide UK installer network.
- Vaillant — a long-standing heating brand; its aroTHERM air source range is widely fitted and many recent models use R290 refrigerant for higher flow temperatures.
- Mitsubishi Electric (Ecodan) — a popular and well-supported range in the UK with strong installer familiarity and parts availability.
- Samsung (EHS) — a competitive range, often noted for value, with monobloc options including R290 models.
- Grant (Aerona) — a brand with strong presence in off-gas-grid and rural UK heating, frequently paired with matched cylinders and emitters.
- Nibe — a Scandinavian manufacturer with a strong reputation in both air source and ground source systems.
Other reputable options you may be quoted include Panasonic, LG, Worcester Bosch and Stiebel Eltron.
How the brands compare on the things that matter
Rather than ranking brands, it is more useful to compare them on the practical factors that affect ownership. Most reputable brands are close on headline efficiency; the differences that show up in real life are availability, support and how well the installer knows the kit.
| Factor | What to check | Why it matters |
|---|---|---|
| Output range | Does it have a model that matches your heat loss? | Correct sizing drives efficiency and comfort |
| Refrigerant | R290 vs R32 / older R410A | R290 supports higher flow temps and lower GWP |
| Warranty | Length and what it covers | Longer cover reduces long-term risk |
| Parts availability | UK stock and lead times | Affects repair speed if a fault occurs |
| Installer familiarity | Does your installer fit this brand often? | Design and commissioning quality |
| Noise data | Published sound power level | Matters for boundaries and bedrooms |
Indicative factors for guidance, not a ranking. Sources: MCS; Which?; Energy Saving Trust.
Warranty, support and parts availability
Beyond efficiency, the things that shape long-term ownership are warranty, support and how quickly a part can be obtained if something fails. Warranty length and terms vary by brand and sometimes depend on the system being registered and serviced; a longer warranty reduces the risk of a costly repair bill in the early years, but read what it actually covers — the compressor, the full unit, parts only, or parts and labour.
Parts availability is easy to overlook but matters when a fault occurs in mid-winter. Brands with a large, established UK presence — such as Mitsubishi Ecodan, Daikin and Vaillant — tend to have wide stock and quick lead times, which can mean a faster repair. Newer or less common ranges may be perfectly good but harder to source parts for at short notice.
Manufacturer support also helps your installer. Brands with strong UK technical support, training and design tools make it easier for an installer to size and commission the system correctly. This is part of why installer familiarity with a brand is such a strong predictor of a good outcome — the support ecosystem around the brand feeds into the quality of your specific install.
How to choose without chasing a 'best' brand
Start with a heat loss survey from an MCS-certified installer. That defines the output you need, which narrows the brands to those with a suitable model. From there, weigh warranty length and terms, UK parts availability, published noise figures, and whether your installer regularly fits and commissions that brand — familiarity tends to mean a better-tuned system.
Refrigerant is worth noting: many newer ranges use R290, which has a very low global warming potential and supports higher flow temperatures, useful for retrofits with existing radiators. Independent testing bodies such as Which? publish reliability and satisfaction data that can inform a shortlist. Ultimately, the brand decision should follow the system design, not lead it — a good installer working with a brand they know well is the strongest predictor of a heat pump that is efficient, quiet and dependable.
Frequently asked questions
Which heat pump brand is the best in the UK?
There is no single best brand. Daikin, Vaillant, Mitsubishi Ecodan, Samsung, Grant, Nibe and others all make reliable units, and most modern models reach a similar SCOP. What determines real-world performance is correct sizing, system design and installation quality by an MCS-certified installer — far more than the badge on the outdoor unit.
Does the refrigerant type matter when choosing a brand?
It can. Many newer ranges use R290 refrigerant, which has a very low global warming potential and supports higher flow temperatures — helpful when keeping existing radiators in a retrofit. Older units may use R32 or R410A. If higher flow temperatures or lower environmental impact matter to you, look for a model using R290.
Should I pick the brand or the installer first?
Choose the installer first. An MCS-certified installer who carries out a proper heat loss survey will recommend a suitably sized model and design the system correctly. A well-designed install from a mainstream brand outperforms a poorly designed one from any brand, so the installer's competence is the priority.
Sources & further reading
- MCS — find a certified installer
- Which? — heat pump brands and reviews
- Energy Saving Trust — air source heat pumps
Figures on this page are typical UK ranges drawn from published sources and depend on your specific home. They are guidance, not a quotation or guaranteed saving.