Best Air Source Heat Pumps UK: Brand Comparison 2026
Choosing a heat pump brand can feel overwhelming. There are over a dozen manufacturers selling into the UK market, each claiming to be the best. The truth is more nuanced — different brands suit different situations, and the quality of installation matters far more than the badge on the box.
That said, there are genuine differences between brands in terms of efficiency, noise levels, reliability, warranty terms, and price. This guide compares the six most popular air source heat pump brands in the UK market, based on real-world performance data, installer feedback, and owner experiences.
Quick Comparison Table
| Brand | Key Model | SCOP Range | Noise (dB at 1m) | Warranty | Price Range (unit only) |
|---|---|---|---|---|---|
| Daikin | Altherma 3 | 3.0 – 4.3 | 37 – 49 | 5 years (extendable) | £3,500 – £6,500 |
| Vaillant | Arotherm plus | 3.2 – 4.5 | 35 – 48 | 5 years (extendable to 7) | £3,800 – £7,000 |
| Mitsubishi | Ecodan | 2.9 – 4.0 | 40 – 52 | 5 years | £3,200 – £6,200 |
| Samsung | EHS Mono | 3.0 – 4.1 | 38 – 50 | 5 years | £2,800 – £5,500 |
| Nibe | F2120 | 3.1 – 4.4 | 36 – 46 | 5 years (extendable to 7) | £4,000 – £7,500 |
| Bosch | Compress 7400i | 3.0 – 4.2 | 38 – 50 | 5 years (extendable) | £3,200 – £6,000 |
Note: SCOP ranges reflect performance at different flow temperatures and sizes. Noise figures are for standard operating conditions. Prices are approximate for the outdoor unit only.
Daikin Altherma 3
Overview
Daikin is the world's largest heat pump and air conditioning manufacturer, and the Altherma 3 is their flagship residential heat pump for the UK market. It uses R32 refrigerant and is available in sizes from 4kW to 16kW.
Strengths
- Largest installer network in the UK: More installers are trained and experienced with Daikin than any other brand, which means easier access to servicing and spare parts
- Proven reliability: Daikin have been selling heat pumps in the UK for over 15 years. Their track record is long and well-documented
- Good controls: The Daikin app and Onecta system provide decent remote monitoring and control
- Wide size range: Available from 4kW to 16kW in a single unit, covering most domestic applications
Weaknesses
- Not the cheapest option — mid-to-upper price range
- R32 refrigerant will face phase-down under F-Gas regulations (though this affects servicing, not current performance)
- Standard warranty is only 5 years without extension
Vaillant Arotherm Plus
Overview
Vaillant are well known in the UK for their gas boilers, and they have transferred that expertise into heat pumps. The Arotherm plus uses R290 (propane) refrigerant — a natural, future-proof choice — and is one of the quietest units on the market.
Strengths
- R290 refrigerant: Propane has a negligible global warming potential and is not subject to the F-Gas phase-down. This is a genuinely future-proof choice
- Exceptionally quiet: The Arotherm plus is one of the quietest heat pumps available, with noise levels as low as 35 dB(A)
- High SCOP: Consistently achieves some of the highest real-world efficiency figures in the UK
- Strong brand reputation: Vaillant's boiler heritage means good installer networks and service infrastructure
Weaknesses
- The most expensive option in this comparison
- R290 requires a minimum distance from openable windows and doors (usually 1-2 metres), which can limit positioning options
- Slightly fewer installers trained specifically on this model compared to Daikin
Mitsubishi Ecodan
Overview
The Ecodan range has been one of the best-selling heat pumps in the UK for over a decade. Mitsubishi Electric have invested heavily in UK-specific training and support, and the Ecodan is a tried-and-tested choice.
Strengths
- Longest UK track record: More Ecodan units installed in the UK than almost any other brand. This means extensive real-world data on performance
- Strong cold-weather performance: Tested and rated for operation down to -25°C
- Excellent training programme: Mitsubishi's installer training is widely regarded as among the best in the industry
- Good value: Competitive pricing for a well-established, reliable product
Weaknesses
- Noise levels are slightly higher than Vaillant and Nibe at equivalent sizes
- Uses R32 refrigerant (same F-Gas considerations as Daikin)
- Controls and app interface are functional but not the most user-friendly
Samsung EHS Mono
Overview
Samsung entered the UK heat pump market more recently but have made rapid progress. The EHS Mono range offers competitive performance at a lower price point than most rivals, making it an attractive option for budget-conscious buyers.
Strengths
- Best value for money: Consistently the cheapest option for equivalent performance levels
- Solid performance: COP and SCOP ratings are competitive with more expensive brands
- Smart home integration: Samsung's SmartThings platform provides good app-based control
- Growing installer network: Samsung are investing heavily in UK installer training
Weaknesses
- Shorter UK track record than Daikin, Vaillant, or Mitsubishi
- Fewer experienced installers (though this is improving)
- Spare parts availability can sometimes be slower than for longer-established brands
Nibe F2120
Overview
Nibe is a Swedish manufacturer with decades of experience in cold-climate heat pumps. The F2120 is their premium offering for the UK market, using R290 refrigerant and featuring some of the most advanced controls available.
Strengths
- Outstanding cold-weather performance: Designed for Scandinavian winters, so UK winters pose no challenge
- Very quiet: Among the quietest units on the market, rivalling Vaillant
- R290 refrigerant: Future-proof, low environmental impact
- Excellent smart controls: Nibe myUplink provides sophisticated monitoring and remote adjustment
Weaknesses
- Premium pricing — the most expensive option alongside Vaillant
- Smaller UK installer network compared to Daikin and Mitsubishi
- Less widely known in the UK, which can make finding experienced local installers harder outside major cities
Bosch Compress 7400i
Overview
Bosch (and their Worcester Bosch subsidiary) are leveraging their massive UK boiler installer network to push into the heat pump market. The Compress 7400i is their current flagship, and it benefits from the existing Worcester Bosch service infrastructure.
Strengths
- Massive installer and service network: Worcester Bosch engineers are being retrained on heat pumps, giving excellent geographic coverage
- Good integration with existing Worcester systems: If you have Worcester controls or cylinders, there are compatibility advantages
- Competitive pricing: Mid-range pricing with good performance
- Strong warranty support: Bosch's service reputation is well-established
Weaknesses
- Relatively new to the heat pump market compared to Daikin and Mitsubishi
- R410A refrigerant on some models (higher GWP than R32 or R290)
- Not the quietest option available
Which Brand Should You Choose?
There is no single "best" brand. The right choice depends on your priorities:
- Best all-rounder: Daikin Altherma 3 — widest installer network, proven reliability, solid performance
- Best for noise-sensitive locations: Vaillant Arotherm plus or Nibe F2120 — both exceptionally quiet
- Best for future-proofing: Vaillant Arotherm plus or Nibe F2120 — R290 refrigerant avoids F-Gas phase-down concerns
- Best value for money: Samsung EHS Mono — competitive performance at the lowest price
- Best track record: Mitsubishi Ecodan — the longest-established heat pump in the UK market
- Best service network: Bosch/Worcester Bosch — leveraging their existing nationwide engineer network
However, we cannot stress this enough: the installer matters more than the brand. A well-designed, well-installed Samsung system will outperform a poorly installed Vaillant system every time. Focus on finding a competent, experienced MCS-certified installer first, then discuss which brand suits your property with them.
Use our free quote service to be matched with experienced installers in your area who can recommend the right brand for your specific situation.
Frequently Asked Questions
Does the brand of heat pump affect the BUS grant?
No, as long as the heat pump is MCS-certified (which all the brands listed here are). The £7,500 grant applies regardless of brand. See our grants guide for full details.
What warranty should I expect?
All major brands offer a minimum 5-year manufacturer warranty on the compressor and main components. Some brands (Vaillant, Nibe) offer extensions to 7 years. Your installer should also provide a separate workmanship warranty (typically 2-5 years) covering the quality of the installation itself.
Can I choose the brand, or does the installer decide?
Most installers work with 2-3 preferred brands. You can express a preference, but a good installer will recommend the brand they are most experienced with and that best suits your property. Installing a brand the installer rarely works with is usually a worse outcome than accepting their preferred option.
Are more expensive brands worth the extra money?
Sometimes. If noise is a major concern (terraced house, bedroom window nearby), paying extra for a Vaillant or Nibe is worthwhile. If budget is tight and noise is not an issue, a Samsung or Grant can deliver excellent performance for less money. The efficiency differences between brands are smaller than many people assume.
What about brands not listed here?
Other reputable brands available in the UK include Grant (popular in Ireland and rural UK), LG (strong in commercial but growing in domestic), and Panasonic (Aquarea range). We focused on the six most commonly installed brands, but these alternatives are all viable choices.