Mitsubishi Ecodan Heat Pump Review: UK's Most Installed Brand

If you have spoken to a heat pump installer in the UK, there is a very good chance the Mitsubishi Ecodan was one of the first brands they mentioned. With over 250,000 units installed across Britain, the Ecodan has an unmatched track record of proven reliability, readily available spare parts, and extensive real-world performance data. For homeowners who want a low-risk, well-supported choice, the Ecodan remains the benchmark.

This review examines the current Mitsubishi Ecodan range, covering specifications, real-world COP data, reliability, pricing, and where competitors have pulled ahead. Compare it against other brands in our full UK brand comparison guide.

The Ecodan Range

Mitsubishi offers the Ecodan in monobloc, Ultra Quiet, and split system configurations to suit different UK properties.

The monobloc models contain all refrigerant within the outdoor unit, simplifying installation. The Ultra Quiet models incorporate additional noise-reduction features achieving 42–45dB at one metre. The split system can achieve slightly higher COP but requires F-gas qualified installation.

Proven Reliability: The Ecodan's Greatest Strength

With over 250,000 UK installations and many systems running for 10 to 15 years, there is an enormous body of real-world reliability data. Key factors include:

• Scroll compressor: Well-proven and durable with rare failures within 15 years when properly maintained
• Mature product design: Refined over multiple generations with early issues long resolved
• Spare parts: The most readily available of any brand in the UK, typically within 24 hours
• Service network: A large number of independent engineers have Ecodan training

Real-World COP Performance

The Ecodan's SCOP of up to 4.30 is competitive but not the highest. Daikin and Vaillant achieve slightly higher figures. However, real-world differences are often smaller than lab figures suggest.

The key to good Ecodan COP is running at the lowest possible flow temperature, using weather compensation, and ensuring correct sizing via a proper heat loss calculation.

MELCloud: Monitoring and Smart Control

Mitsubishi's MELCloud system provides cloud-based monitoring including real-time COP tracking, energy monitoring, error code notifications, and remote diagnostics for installers. This is one of the more capable monitoring platforms among domestic heat pump brands.

Noise Levels

Standard monobloc models produce 45–49dB at one metre — louder than the quietest Samsung (35dB) and Daikin (37dB) models. The Ultra Quiet models improve this to 42–45dB. For properties with very close neighbours, the quieter alternatives may have an advantage.

Pricing

The Ecodan sits mid-range — less expensive than Vaillant and competitive with Daikin. After the Boiler Upgrade Scheme grant, out-of-pocket costs can be as low as £500 for smaller systems.

Ecodan vs Competitors

Ecodan vs Daikin Altherma 3

Daikin achieves slightly higher SCOP and lower noise. Ecodan offers a larger UK install base, better reliability data, and arguably better monitoring via MELCloud. Both use R32. Either is excellent.

Ecodan vs Vaillant Arotherm Plus

Vaillant wins on refrigerant (R290), max flow temperature (75°C vs 55/60°C), and SCOP. Ecodan wins on price, proven reliability, and installer familiarity. For older homes needing high temperatures, Vaillant has the edge.

Ecodan vs Samsung EHS

Samsung is typically cheaper with lower noise. Ecodan has a far longer UK track record and larger service network. For proven reliability, Ecodan is safer. For value and quiet operation, Samsung is compelling.

Pros and Cons

Pros

• Most installed heat pump brand in the UK — unmatched 15+ year track record
• Excellent reliability and durability proven across 250,000+ installations
• Largest dedicated heat pump installer network in Britain
• Best spare parts availability of any brand
• Good MELCloud monitoring with real-time COP data
• Competitive mid-range pricing
• Ultra Quiet models for noise-sensitive installations

Cons

• SCOP slightly behind Daikin and Vaillant
• Standard models noisier than quietest alternatives
• Still uses R32 — not yet transitioned to R290
• Max flow temperature of 55–60°C may not suit the oldest properties
• FTC6 controller is functional but not as polished as Vaillant's sensoCOMFORT

Frequently Asked Questions

Is the Mitsubishi Ecodan a good heat pump?

Yes. The Ecodan is the most installed heat pump in the UK for good reason. It is reliable, competitively priced, well-supported, and achieves good real-world efficiency with an unmatched track record.

How much does a Mitsubishi Ecodan cost installed?

Total installed costs typically range from £8,000 to £13,000 before the BUS grant. After the grant (up to £7,500), typical out-of-pocket costs are £1,500 to £6,000.

How long do Mitsubishi Ecodans last?

With regular annual servicing, 15 to 20 years is the expected lifespan. Many early UK installations from 2010–2012 are still running well.

What COP does the Ecodan achieve in practice?

Real-world seasonal COP is typically 3.0 to 3.6 at low flow temperatures (35–40°C) and 2.5 to 3.0 at higher flow temperatures (45–55°C). Check your running costs with our calculator.

Is the Ecodan quiet?

The Ultra Quiet models achieve 42–45dB at one metre. Standard models are 45–49dB — louder than the quietest competitors but compliant with MCS noise standards in most settings.

Does Mitsubishi offer R290 refrigerant?

As of early 2026, the UK Ecodan range uses R32. Mitsubishi has R290 models in development but has not yet launched them in the UK domestic market.