We don’t earn affiliate commissions from any heat pump brand, and we don’t have a preferred installer network with a financial stake in what you buy. That puts us in a good position to give you an honest comparison of the best heat pump brands available in the UK in 2026. The short version: the brand matters, but the installer matters more. A well-configured Vaillant installed badly will underperform a less prestigious brand installed well. Keep that in mind as you read.
We assess brands across five dimensions:
Our assessments draw on publicly available efficiency data, Nesta’s field trial data, and published consumer research from Which?. We do not accept advertising from any brand featured here.
Daikin is the world’s largest HVAC manufacturer and one of the most widely installed heat pump brands in the UK. Their Altherma range covers residential air source heat pumps from 4kW to 16kW.
| Metric | Assessment |
|---|---|
| Efficiency (SCOP A7/W35) | Up to 5.08 (Altherma 3 R) |
| Reliability | Strong — well-established in UK market |
| Installer availability | Excellent — wide Daikin D1 network |
| Controls | Good app and weather compensation; some users find setup complex |
| Standard warranty | 2 years parts and labour (extendable to 5 years) |
Best for: Homeowners who want a well-supported brand with wide installer choice and a proven track record. Daikin’s large installer network means competitive quotes and easier aftercare.
Vaillant is a strong choice for gas boiler households upgrading to a heat pump, because many UK gas engineers are already trained on the brand. Their aroTHERM Plus is widely specified and performs well in real-world conditions.
| Metric | Assessment |
|---|---|
| Efficiency (SCOP A7/W35) | Up to 5.6 (aroTHERM Plus 7kW) |
| Reliability | Good — established brand with strong UK warranty support |
| Installer availability | Very good — large UK network via Vaillant Pro |
| Controls | sensoCOMFORT app is well-regarded; intuitive setup |
| Standard warranty | 5 years (one of the stronger standard warranties) |
Best for: Homeowners who value a familiar plumbing brand with strong warranty terms and good controls. The aroTHERM Plus consistently appears in top installer recommendations.
Mitsubishi Electric’s Ecodan range is one of the most specified heat pumps in UK social housing and new build projects, giving it an unusually large and well-distributed installer base. The Ecodan is particularly strong in cold-weather performance.
| Metric | Assessment |
|---|---|
| Efficiency (SCOP A7/W35) | Up to 4.74 (Ecodan R32 6kW) |
| Reliability | Very good — extensive UK field history |
| Installer availability | Excellent — Mitsubishi Ecodan-trained network is large |
| Controls | MELCloud app is functional; less polished than some competitors |
| Standard warranty | 2 years (extendable to 5 years with registration) |
Best for: Homeowners who want proven reliability and maximum installer availability, particularly in Scotland and Northern England where cold-weather performance matters more.
Samsung’s EHS (Eco Heating System) range offers competitive efficiency ratings at lower price points, making it a popular choice among installers focused on value. Samsung heat pumps use R32 refrigerant and have improved significantly since earlier generations.
| Metric | Assessment |
|---|---|
| Efficiency (SCOP A7/W35) | Up to 5.1 (Gen 7 EHS Mono) |
| Reliability | Good but fewer long-term UK field reports than Japanese/German brands |
| Installer availability | Growing but narrower than Mitsubishi or Daikin |
| Controls | SmartThings integration; good app experience |
| Standard warranty | 2 years (extendable to 5 years) |
Best for: Cost-conscious homeowners whose installer recommends Samsung — the efficiency numbers are strong and the price is often lower. Less ideal if installer availability in your area is limited.
Grant Engineering is a UK-based manufacturer best known for oil boilers, but their Aerona⁴ heat pump has gained traction particularly with oil heating replacements. Their strong existing UK service network is a genuine advantage.
| Metric | Assessment |
|---|---|
| Efficiency (SCOP A7/W35) | Up to 4.2 (Aerona⁴ R32) |
| Reliability | Solid — UK-based support and parts |
| Installer availability | Good — particularly strong in rural and oil-heated areas |
| Controls | Functional but less feature-rich than Japanese brands |
| Standard warranty | 2 years (extendable to 5 years) |
Best for: Rural homeowners replacing oil heating where Grant’s existing service network means faster support and more local installers.
No single brand is right for every home, and the gap in real-world performance between the major brands is smaller than manufacturer marketing would suggest. The Heat Pump Association’s consumer resources include a useful guide to what to look for in product specifications.
Our recommendation: let the installer lead on brand choice, but ask them to justify it. A good installer will specify the brand they know best and can support — which is more valuable than the theoretical efficiency advantage of a brand they rarely work with. Get three quotes from MCS-certified installers (check mcscertified.com), compare not just price but specified model, system design, and warranty, and you’ll be in good shape. Full installation cost guidance is in our heat pump costs guide, and the installation guide explains what the process looks like from survey to commissioning.
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