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Best Heat Pump Brands UK 2026 — Daikin, Mitsubishi, Vaillant, Samsung, Worcester Bosch Compared

Last reviewed: 13 May 2026

The major heat pump brands available in the UK in 2026 — what each one is good at, the current specifications, and an honest answer to "which is best for me?" that doesn't pretend brand choice is the most important decision.

Air source heat pump outdoor unit — heat pump brands compared

In short

The leading heat pump brands in the UK in 2026 are Vaillant (industry-leading efficiency at SCOP 5.09, R290 refrigerant, high flow temperatures suitable for period properties), Viessmann (best real-world performance in field studies at SCOP 4.1 average across monitored UK installs), Daikin (widest cold-weather operating range and the most sophisticated controls software), Mitsubishi (quietest models at 45 dB(A), strong cold-weather Zubadan technology), Samsung (best value at typically £2,000–£4,000 below Vaillant equivalents, with some reported service concerns), and Worcester Bosch (the gas-boiler-incumbent option with solid mid-market performance). Newer entrants include Octopus (Cosy 6) and Aira (Swedish subscription-pricing model). The honest meta-finding: the installer’s design and commissioning quality drives your real-world running cost more than the brand choice does. A skilled MCS installer fitting any of these brands well delivers better outcomes than a lazy installation of the best-on-paper brand.

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What brand choice actually determines (and what it doesn’t)

Before the brand-by-brand breakdown, a framing point worth being honest about.

The brand choice in your heat pump install determines:

  • The product’s technical capability ceiling — published SCOP, refrigerant type, output sizes, sound rating, operating temperature range
  • The warranty and post-install support — manufacturer warranty length, parts availability, service network
  • Which installers in your local area can quote and install the model
  • Smart home and tariff compatibility — control apps, OpenTherm support, integration with solar PV

The brand choice does not determine to the same extent:

  • Your real-world SCOP — overwhelmingly driven by install quality (heat-loss survey accuracy, sizing, flow temperature design, commissioning) rather than the brand’s published rating. A 5.0-SCOP-rated model installed badly might achieve 2.8 in practice; a 4.0-SCOP-rated model installed well achieves 4.0.
  • Your running cost — driven by your achieved SCOP, your tariff choice (£200–£350 per year between standard and heat-pump tariff), and your property’s heat demand
  • Whether your heat pump “works” — every MCS-certified model from every listed brand will heat a UK home. The differences are at the margins.

This article gives you the brand-specific facts. The next section after the brand list (§The cross-brand framework) is what actually matters across all of them, and the section after that (§The meta-finding) is the honest hierarchy of decisions in your install.

Vaillant aroTHERM plus

Refrigerant: R290 (propane), GWP 3 Output range: 3.5–12 kW SCOP: Up to 5.09 at 35°C flow temperature (MCS-certified — industry-leading among current UK residential models) Maximum flow temperature: 75°C (the highest in the current UK market) Operating range: Down to -25°C ambient Sound rating: 54 dB(A) sound power; Quiet Mark certified on 4 of 5 models Energy rating: A+++ Warranty: Manufacturer-standard 5-year, extendable

What it’s good at: Vaillant’s aroTHERM plus is currently the headline performer in the UK market — highest published SCOP and a 75°C maximum flow temperature that makes it the standard choice for Victorian and Edwardian terraced retrofits where existing radiators were sized for a gas boiler’s high flow. Customer satisfaction sits at 4.6/5 Trustpilot (cited via Bristol Heat Pump’s UK brand comparison).

Where it sits on price: Typically £500–£1,500 above Samsung equivalent for the same output.

Viessmann Vitocal 150-A / 250-A

Refrigerant: R290 (propane), GWP 0.02 Output range: 3–13 kW (150-A); larger outputs in 250-A SCOP: Up to 5.1 at 35°C flow temperature (manufacturer-certified) Real-world performance: A Viessmann-published 12-month field study of 7 UK Vitocal 150-A installs (January 2026) showed an average SCOP of 4.1, with COP holding at 3.0 on the coldest recorded days. Independent monitoring on HeatpumpMonitor.org’s billing-grade-metered platform cites the Vitocal 150-A as the best-performing model across 252 monitored UK installs at 3.96 average. Maximum flow temperature: 70°C Operating range: Down to -25°C Sound rating: 47 dB(A) at typical operating conditions Energy rating: A+++

What it’s good at: Viessmann’s Vitocal 150-A is the closest competitor to Vaillant on R290 leadership and arguably the strongest real-world performer based on both Viessmann’s own field-study data and the independent HeatpumpMonitor.org platform. The 70°C maximum flow temperature is slightly below Vaillant’s 75°C but still well above standard R32 systems — period-property friendly.

Daikin Altherma 3

Refrigerant: R32 (standard models) or R290 (Altherma 3 H HT eco-models) Output range: 4–16 kW SCOP: Up to 4.7 Maximum flow temperature: 65°C (R32 standard); 70°C (R290 eco-model) Operating range: Down to -28°C — the widest cold-weather operating envelope of mainstream UK brands Sound rating: 50–55 dB(A) Warranty: Up to 12-year extended warranty available Controls: Daikin Onecta app — the most sophisticated control software currently available for UK residential heat pumps. Integrates with solar PV, time-of-use tariffs, and multiple heating zones.

What it’s good at: Daikin is the longest-established air-conditioning manufacturer in the global market and brings that engineering depth to heat pumps. The Altherma 3’s -28°C operating envelope is well beyond UK climatic conditions — meaningful as robustness margin rather than everyday-use difference. The standout feature is the Onecta app, which does things competitor controls don’t (multi-zone heating optimisation, integrated solar PV management, sophisticated time-of-use tariff scheduling). For homes with existing solar PV or those switching to tariffs like Octopus Agile, the Daikin controls advantage is material.

Mitsubishi Ecodan

Refrigerant: R32 (with Zubadan cold-climate technology) plus a newer R290 monobloc range (5, 6, 8.5, 10, 12 kW) Output range: 5–14 kW (R32); 5–12 kW (R290) SCOP: Up to 4.9 (R32 with Zubadan); slightly higher on R290 monobloc Maximum flow temperature: 60°C (R32); 70°C (R290) Operating range: Down to -20°C (R32 Zubadan); -25°C (R290) Sound rating: As low as 45 dB(A) at 1 metre on smaller models — the quietest residential ASHP in the current UK market Warranty: 7-year warranty standard via Alto Energy distribution

What it’s good at: Mitsubishi’s Ecodan is the noise-conscious choice — the 45 dB(A) sound rating on smaller monobloc models is genuinely quiet enough to install close to bedrooms or neighbouring properties without complaint. Zubadan cold-climate technology means the R32 range performs well in sustained low temperatures; the new R290 range brings the refrigerant advantage without sacrificing the Zubadan engineering. Mitsubishi’s installer ecosystem in the UK is broad — most MCS-certified installers can quote Ecodan models.

Samsung EHS

Refrigerant: R32 (standard); R290 (newer EHS Mono HT range) Output range: 5–14 kW SCOP: Up to 4.5–4.7 Maximum flow temperature: 60–65°C Operating range: Down to -25°C Sound rating: 55–60 dB(A)

What it’s good at: Samsung’s EHS range is the price-competitive option — typically lands £2,000–£4,000 below Vaillant or Daikin equivalents for comparable output. Performance is solid; SCOP and flow-temperature figures don’t match the R290 leaders but are well above the MCS 2.8 minimum needed for the BUS grant.

The honest concern: Samsung’s UK service infrastructure has been reported as comparatively weak versus the European-engineering brands, with complaints around parts availability and service response times. The pattern in UK installer feedback: Samsung makes most sense when your installer has direct, established relationships with Samsung’s UK support and can effectively backstop the service risk; less so as a default DIY-research choice. Worth asking any installer quoting Samsung what their relationship with Samsung service is, and what their plan would be for a parts-needed warranty claim.

Worcester Bosch heat pump range

Refrigerant: R32 Output range: 5–17 kW (Worcester Bosch Greenstore range) SCOP: Up to 4.4 Maximum flow temperature: 55–60°C Operating range: Down to -20°C Sound rating: 52–57 dB(A)

What it’s good at: Worcester Bosch is the UK’s dominant gas-boiler brand. The heat pump range is solid rather than spectacular — SCOP, flow temperature, and noise all in the middle of the market. The brand’s real strength is installer familiarity and gas-boiler-customer continuity: if you’re replacing a Worcester Bosch boiler, Worcester Bosch-trained installers already know the brand’s products, parts, and warranty processes. Customer satisfaction is high (4.6/5 Trustpilot) driven largely by service consistency rather than performance leadership.

Newer entrants — Octopus and Aira

Octopus Cosy 6: Octopus Energy’s own-brand 6 kW heat pump, designed for the UK market and tightly integrated with Octopus tariff structures. R32 refrigerant, SCOP around 4.0. The Octopus advantage is the integrated tariff + heat pump + smart home stack; the trade-off is that lock-in to Octopus tariffs reduces your switching flexibility later. For homeowners who plan to stay with Octopus long-term, it’s a clean integrated choice.

Aira: Swedish company that entered the UK market in 2023, pricing aggressively for small-to-medium installs. R32 refrigerant, SCOP 3.9–4.5. Aira’s distinctive offer is the subscription pricing model — heat pump installed for a monthly fee rather than capital purchase. Worth understanding before signing: the lifetime cost can be higher than capital-purchase routes but the upfront commitment is lower. Aira is newer to the UK market, so warranty and service track record is less established than the European-engineering incumbents.

The cross-brand framework — what actually matters

Stepping back from the brand-by-brand specs, here are the cross-cutting factors that actually matter for your install:

Refrigerant — R290 vs R32

R290 (propane) is the better long-term refrigerant choice. GWP of just 3 versus R32’s 675. The EU bans refrigerants with GWP above 150 in new ≤12 kW split heat pumps from January 2027; the UK hasn’t legislated to match this yet, but the manufacturers are converging on R290 across their European ranges. R32 systems are typically £500–£1,500 cheaper at the moment but face a tightening regulatory environment over the next 5–10 years.

For a 2026 install, R290 is the safer long-term specification — and it’s needed anyway for the higher flow temperatures (70–75°C) that retrofit period properties without full radiator replacement.

Flow temperature ceiling

This is the spec that most differentiates brands for retrofit applications:

  • R290 leaders (Vaillant aroTHERM plus, Viessmann Vitocal 150-A, Mitsubishi Ecodan R290): 70–75°C maximum flow — retrofit-friendly for period properties
  • R32 systems (most non-R290 models): 55–65°C maximum — need larger emitters for the same heat delivery

For Victorian or Edwardian terraced retrofits, the R290 high-flow option matters. For modern-property retrofits where designing at 45°C flow is achievable, R32 at 60°C is often fine.

Sound rating

Mitsubishi Ecodan small monobloc models at 45 dB(A) are the quietest in the market. Vaillant aroTHERM plus at 54 dB(A) is middle. Samsung and Worcester Bosch are at 55–60 dB(A).

For installations near bedrooms, conservatories, or neighbouring property windows, sound rating matters. For larger gardens with distance from sensitive locations, the difference is smaller.

Operating temperature range

Daikin’s -28°C is the widest. UK reality (Reading design temperature is around -3.4°C) means every listed brand operates comfortably within UK winter conditions. Cold-weather range matters more for genuinely cold-region UK (Highlands, North Pennines) than for Reading-like climates.

Controls and app

Daikin Onecta is the most sophisticated control software. Octopus Cosy 6 integrates tightly with Octopus tariffs. Most other brands have functional but less differentiated control apps.

For homes with solar PV, multi-zone heating, or active time-of-use tariff management, controls quality is a real differentiator. For straightforward single-zone always-on operation, the gap is smaller.

Warranty and service

Vaillant, Daikin, and Viessmann offer extended warranties up to 10–12 years. Mitsubishi standard 7 years via Alto Energy. Samsung warranty period is similar but service-support concerns reported. Worcester Bosch service infrastructure is well-established. A 10-year warranty covers two-thirds of a heat pump’s expected lifespan; worth weighting in the decision.

Installer ecosystem

A brand is only useful if local MCS-certified installers carry it. An installer’s brand recommendation reflects what they install most and best — which often delivers a better real-world outcome than a brand-objective best they’re less familiar with. Always ask installers which brands they’re trained on and prefer.

The meta-finding — why “the installer matters more than the brand”

Across the brand-specific information above, the consistent finding from UK installer practice and field-study data: brand choice is the third or fourth most important decision in a heat pump install. The first three are:

  1. Heat-loss survey accuracy. A properly-sized system on any major MCS-approved brand outperforms an over- or under-sized system on the technically-best brand. The survey is what makes the system size right.
  2. Flow temperature design. Designing for 45°C delivery (better SCOP) vs 55°C delivery (lower SCOP) makes more difference to your annual running cost than the gap between two top-rated brands. The design is what makes the system efficient in your specific property.
  3. Commissioning depth. Controls tuned to your specific property over the first heating season makes more difference than the brand’s specification ceiling. The commissioning is what makes the system achieve its design SCOP rather than under-perform it.

The phrase repeated by experienced UK installers: “The installer matters more than the brand.” A skilled MCS-certified installer fitting any of the brands above well delivers better outcomes than a lazy install of the best-on-paper brand.

Where brand choice does meaningfully matter:

  • Period-property retrofits where you need high flow temperatures — favours the R290 leaders: Vaillant aroTHERM plus, Viessmann Vitocal 150-A, Mitsubishi Ecodan R290
  • Installations close to bedrooms or neighbours where noise matters — favours Mitsubishi Ecodan’s small monobloc range
  • Homes with solar PV, multi-zone heating, or active tariff management — favours Daikin Onecta controls
  • Replacing an existing Worcester Bosch boiler with installer continuity preferred — favours Worcester Bosch heat pump range
  • Tight budget where a £2,000 saving matters more than premium R290 specification — Samsung EHS (with the installer-relationship caveat)

For most middle-of-the-market UK installs — a typical 3-bed semi with modern radiators or moderate retrofit work — Vaillant aroTHERM plus, Viessmann Vitocal 150-A, Daikin Altherma 3 R290, and Mitsubishi Ecodan R290 are all defensible choices. At that level, the differentiator is which one your installer is trained on and prefers.

What this means for homes in Reading

Reading’s housing stock maps onto brand preference roughly as follows:

Modern estates in Lower Earley, Woodley, and the western expansion areas are well-suited to any of the major brands. R32 systems are fine because lower flow temperatures (35–50°C) are easily achievable with the modern radiator stock. Brand differentiation comes down to installer preference, controls sophistication, and warranty considerations rather than specification ceiling.

Inter-war semis in Tilehurst, Earley, Whitley, and parts of Caversham are the typical case. Either R32 or R290 works depending on what radiator-upgrade scope makes sense. Vaillant aroTHERM plus or Viessmann Vitocal 150-A are common picks for these properties — strong all-round performance plus R290 future-proofing. Mitsubishi Ecodan R290 is a strong noise-conscious option for installations close to neighbours.

Period properties in central Reading and lower Caversham — Victorian and Edwardian terraces — benefit most from the R290 high-flow-temperature leaders. Vaillant aroTHERM plus (75°C max flow) or Viessmann Vitocal 150-A (70°C max flow) are the natural picks because they allow the system to deliver useful heat at the higher flow temperatures these properties’ existing radiators need without full replacement.

For Reading’s modest cold-weather climate (-3.4°C design temperature), every listed brand operates well within its operating envelope. Daikin’s -28°C engineering margin is impressive but not necessary for Reading conditions.

Reading sits in SSEN territory for electrical network, and all major UK heat pump brands have established service networks reaching the Reading-Berkshire-Thames-Valley area. No regional brand limitation applies.

For all property types: when you get a quote from us, the brand recommendation comes from the design — what fits your property, your flow temperature design, and the installer’s expertise. We can install any of the major brands; the design decision drives the brand decision, not the reverse.

Get a quote with brand-appropriate recommendation for your Reading property

The brand that fits your property best is determined by the design — flow temperature, sizing, retrofit scope, and your priorities around noise, controls, and budget. Our free in-home survey includes a full heat-loss calculation and a brand recommendation matched to your specific property, not a default brand we install on every job.

You’ll see the recommended brand and model with reasons, alongside the written quote with the £7,500 BUS grant already deducted.

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