Best Heat Pump Brands UK 2026
9 brands installer-ranked for SCOP, reliability, UK service network, warranty, and value. Mitsubishi, Vaillant, Daikin, Samsung, LG, Grant, Worcester, Panasonic, Nibe — head-to-head with real-world data, not marketing.
How we ranked the brands
This guide ranks brands by what actually matters for UK buyers — not glossy brochures. The five criteria:
- Real-world SCOP in UK climate (not lab COP)
- Fault rate in years 1-5 (installer-reported)
- UK service network — parts availability, engineer coverage, response time
- Warranty length and what it actually covers
- Price after BUS grant for a 9 kW unit installed
Data is drawn from 2024-25 MCS installer surveys, manufacturer warranty documents, and 100+ of my own installs across the East of England. No brand sponsors this site — there are no affiliate links to brand pages.
The 2026 ranking at a glance
| Rank | Brand | Model | SCOP* | Warranty | Installed (after BUS) |
|---|---|---|---|---|---|
| 1 | Mitsubishi | Ecodan R290 | 3.4-3.7 | 7 yr | £8,500-10,500 |
| 2 | Vaillant | aroTHERM Plus | 3.3-3.6 | 7 yr | £8,000-10,000 |
| 3 | Daikin | Altherma 3 R32 | 3.2-3.5 | 5 yr (10 yr w/ installer) | £8,500-10,500 |
| 4 | Grant | Aerona 290 | 3.2-3.5 | 7 yr | £6,500-8,500 |
| 5 | Samsung | EHS Mono R290 | 3.2-3.4 | 7 yr | £7,500-9,500 |
| 6 | LG | Therma V R290 | 3.1-3.4 | 7 yr | £7,500-9,500 |
| 7 | Worcester Bosch | Compress 7800i | 3.0-3.3 | 7 yr | £8,500-10,500 |
| 8 | Panasonic | Aquarea L T-Cap | 3.1-3.4 | 5 yr | £8,000-10,000 |
| 9 | Nibe | S2125 ASHP | 3.2-3.5 | 10 yr (rare) | £9,500-11,500 |
*SCOP range = real UK installs, NOT manufacturer-claimed. Lower end = poor install/old rads. Higher end = well-sized + weather comp + low flow temp.
1. Mitsubishi Ecodan R290 — Editor's choice
The Mitsubishi Ecodan range has been the UK installer favourite for over a decade, and the R290 (propane) refrigerant generation released in 2024 is the strongest version yet. It hits flow temperatures up to 75°C without efficiency collapse — uniquely valuable for retrofits with smaller existing radiators.
Strengths: Lowest fault rate in surveys (under 4% over 5 years). Excellent MELCloud app with SCOP tracking. Wide installer network — easily 1,000+ MCS firms quote it. R290 is future-proof under F-Gas rules.
Weaknesses: Higher upfront cost than Grant or Samsung. Some plumbing complexity — installer needs Mitsubishi-specific training. R290 outdoor unit must be sited >1m from windows/doors (combustible refrigerant rules).
Best for: Retrofits, older homes needing higher flow temps, owners who want install-and-forget reliability.
2. Vaillant aroTHERM Plus — Best for new builds
Vaillant is the UK's leading boiler brand and their aroTHERM Plus heat pump leverages that installer base — over 60% of gas Vaillant installers now also fit their heat pumps. The aroTHERM Plus runs R290 with quiet operation (down to 28 dB at 3m on lowest setting).
Strengths: Quietest in the lineup at low load. Excellent sensoComfort weather-compensation controller. Vaillant has the largest UK parts network — 24-hour part availability nationally.
Weaknesses: The 7 kW unit is sized in 5 kW jumps — gaps in the lineup mean some homes are slightly over- or under-sized. App (sensoApp) less polished than Mitsubishi MELCloud.
Best for: New builds with underfloor heating, urban homes where noise matters, customers already trusting Vaillant boilers.
3. Daikin Altherma 3 R32 — Best for quietness
Daikin pioneered residential heat pumps in Europe and the Altherma 3 remains a benchmark for low noise (down to 35 dB at 1m). The R32 refrigerant is a quirk — most rivals have moved to R290 — but R32 is still permitted in UK for residential.
Strengths: Best inverter modulation in the class (turns down to 25% output without short-cycling). Onecta app is excellent. Strong cooling mode (relevant if you want summer air-con use).
Weaknesses: R32 (higher GWP than R290) may face restrictions post-2030. Daikin's UK aftermarket service is slower than Mitsubishi or Vaillant. Standard warranty is 5 years — you need to ask the installer to extend to 10.
Best for: Urban gardens with close neighbours, owners who use the cooling function.
4. Grant Aerona 290 — Best value
Grant is an Irish-engineered brand with strong UK roots, traditionally known for oil boilers. The Aerona 290 launched 2023 and now represents the best price/performance ratio in the MCS-listed market. R290 refrigerant, full BUS grant eligibility, and UK technical support based in Suffolk.
Strengths: £1,500-2,000 cheaper installed than Mitsubishi. Sized in 1 kW jumps from 6-17 kW (best granularity). Strong technical support and UK-language installer manuals.
Weaknesses: Smaller installer base than Mitsubishi/Vaillant — may need to travel to find a Grant specialist. App less mature than MELCloud or Onecta. Some installers report louder operation than Vaillant or Daikin.
Best for: Off-gas-grid homes (Grant has deep oil-replacement experience), price-sensitive buyers who still want Tier 1 reliability.
5-6. Samsung EHS Mono R290 & LG Therma V R290
Both Korean giants have made aggressive UK heat pump pushes since 2023. Both offer R290, 7-year warranties, and BUS eligibility at competitive prices.
Samsung EHS Mono R290 wins on aesthetics (cleaner outdoor unit design) and SmartThings integration. The R290 generation released 2024 has a stronger UK service network than earlier R32 models.
LG Therma V R290 is functionally similar — slightly better cold-weather performance (T-Cap technology holds output to -25°C) and the LG ThinQ app is solid.
Watch-out for both: UK service networks are still maturing — response times for warranty claims average 5-7 working days vs 2-3 for Mitsubishi/Vaillant.
7. Worcester Bosch Compress 7800i
Worcester Bosch dominates UK boilers (35% market share) and their heat pump pitch leverages installer loyalty. The Compress 7800i is solid but not class-leading.
Strengths: Huge installer network. Boiler-to-pump upgrade marketing makes the process feel familiar to homeowners.
Weaknesses: SCOP runs slightly lower than top 4 brands (3.0-3.3). Premium price for what you get. Worcester's heat pump tech is licensed from Bosch Germany — less UK-specific tuning than Mitsubishi or Grant.
8. Panasonic Aquarea L T-Cap
Panasonic's T-Cap (true capacity) technology holds rated output down to -15°C — historically a strong cold-climate pick. Good build quality but UK installer reach is limited.
Watch-out: 5-year warranty as standard (only 3 years on compressor unless registered within 30 days). Parts availability slower than top brands.
9. Nibe S2125 — Premium Scandinavian
Nibe is the Swedish/Scandinavian premium brand — superbly engineered, often hits SCOP 3.5+ in independent tests, with class-leading 10-year warranty.
Weakness: Highest price in the lineup (£1,500-2,500 more than Mitsubishi installed). UK installer network is small — fewer than 200 MCS firms regularly quote Nibe. Long lead times for parts.
Best for: Buyers who want the absolute best engineering and can wait 3-4 months for install.
Brands to be cautious of
These brands appear in UK quotes but warrant extra due diligence:
- Midea, Gree, Haier — Chinese-made, sold under various rebrands. Some are MCS-listed and BUS-eligible, but warranty support inside the UK is weak. Don't buy without confirming UK-based engineer access.
- Ideal Heating Logic Air — relatively new entry; not enough installed base yet to judge reliability fairly. Wait 2-3 years.
- No-name eBay/AliExpress imports — these are NOT MCS-listed and will void your £7,500 BUS grant. Avoid completely.
Refrigerant matters: R290 vs R32 in 2026
By 2026 the F-Gas regulation is squeezing high-GWP refrigerants. R290 (propane, GWP 3) is the future; R32 (GWP 675) faces gradual restrictions.
If you're buying in 2026, prefer R290 where possible (Mitsubishi Ecodan R290, Vaillant aroTHERM Plus, Grant Aerona 290, Samsung EHS Mono R290, LG Therma V R290). R32 units (Daikin Altherma 3 R32, Panasonic) are not banned and still excellent — but R290 has a longer regulatory runway.
Picking the right size matters more than picking the right brand
The single biggest predictor of running cost isn't the brand — it's the install. A poorly-sized Mitsubishi Ecodan will underperform a well-sized Grant Aerona by 0.6 SCOP.
Get three MCS-certified installer quotes. Reject any quote that doesn't include a written heat loss calculation (room-by-room) and a flow temperature target. See our MCS certification guide for what to verify.