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Mitsubishi Ecodan Heat Pump Review

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. The Ecodan range is the most installed heat pump brand in Britain, with over 250,000 units installed across domestic and light commercial applications. That install base brings significant advantages: a vast network of trained installers, readily available spare parts, and extensive real-world performance data from UK homes.

This review examines the current Mitsubishi Ecodan range, covering specifications, real-world COP data, reliability, pricing, and an honest assessment of where the Ecodan excels and where competitors have pulled ahead.

The Mitsubishi Ecodan Range

Mitsubishi Electric offers the Ecodan range in several configurations to suit different UK property types.

Ecodan Monobloc

The monobloc models contain all refrigerant within the outdoor unit. Only water pipes connect to the indoor system, which simplifies installation and avoids the need for F-gas work inside the property.

  • Capacity range: 4kW to 14kW
  • Refrigerant: R32
  • SCOP (at 35°C): Up to 4.30
  • SCOP (at 55°C): Up to 3.10
  • Max flow temperature: 55°C (standard models), 60°C (Ultra Quiet models)
  • Noise at 1m: 42 to 49dB
  • Operating range: -25°C to +35°C outdoor temperature

Ecodan Ultra Quiet

The Ultra Quiet models incorporate additional noise-reduction features including a larger fan, sound-dampening materials, and optimised airflow design. These models achieve noise levels of approximately 42 to 45dB at one metre, which is a worthwhile improvement over the standard models for properties with nearby neighbours.

Ecodan Split System

Split system models place the compressor and heat exchanger outdoors, with a separate indoor unit containing the plate heat exchanger and controls. This configuration requires F-gas qualified installation for the refrigerant pipework between indoor and outdoor units. Split systems can achieve slightly higher COP than monobloc models because the heat exchange happens closer to the point of use.

The Ecodan's Greatest Strength: Proven Reliability

The single biggest advantage of the Mitsubishi Ecodan is its track record. With over 250,000 installations in the UK and many systems running for 10 to 15 years, there is an enormous body of real-world data confirming its reliability.

Key reliability factors include:

  • Scroll compressor: Mitsubishi's scroll compressor technology is well-proven and durable. Compressor failures are rare within the first 15 years when the system is properly maintained.
  • Mature product design: The Ecodan has been refined over multiple generations. Common early-generation issues (such as defrost cycle problems in very cold weather) have been addressed in current models.
  • Spare parts availability: Due to the massive install base, Ecodan spare parts are among the most readily available of any heat pump brand in the UK. Most parts can be sourced within 24 hours.
  • Established service network: A large number of independent heating engineers have Ecodan training, meaning you are not limited to a small pool of brand-approved installers for servicing and repairs.

For homeowners who prioritise a proven, low-risk choice, the Ecodan's track record is hard to match.

Real-World COP Performance

The Ecodan's manufacturer-stated SCOP of up to 4.30 is competitive but not the highest on the market. Daikin and Vaillant both achieve slightly higher laboratory figures. However, real-world performance differences between brands are often smaller than laboratory figures suggest, because installation quality, system design, and homeowner behaviour have a larger impact on actual efficiency.

Monitored Ecodan installations in UK homes typically achieve:

  • 3.0 to 3.6 seasonal COP when running at 35 to 40°C flow temperature
  • 2.5 to 3.0 seasonal COP when running at 45 to 55°C

These figures are based on data from the Renewable Heat Incentive reporting, the Electrification of Heat Demonstration Project, and independent monitoring by organisations such as the Energy Saving Trust.

The key to good Ecodan COP is the same as for any heat pump: run at the lowest possible flow temperature, use weather compensation, and ensure the system is correctly sized for the property's heat loss.

MELCloud: Monitoring and Smart Control

Mitsubishi's MELCloud system provides cloud-based monitoring and control of the Ecodan. The system comprises a WiFi adapter connected to the heat pump and a smartphone app that allows:

  • Remote temperature adjustment and scheduling
  • Real-time energy monitoring (electricity consumed and heat delivered)
  • COP monitoring (real-time and historical)
  • Error code notifications
  • Remote diagnostics for installers

MELCloud is one of the more capable monitoring platforms among domestic heat pump brands. The ability to track real-time COP is particularly valuable, as it allows homeowners and installers to verify that the system is performing as expected and identify optimisation opportunities.

Noise Levels

This is an area where the Ecodan is slightly behind some competitors. Standard monobloc models produce 45 to 49dB at one metre at rated output, which is louder than the quietest Daikin (37dB) and Samsung (35dB) models.

The Ultra Quiet models improve on this with 42 to 45dB, bringing the Ecodan closer to the competition. At partial load (which is the normal operating condition), noise levels are lower than the rated figures.

For most installations, the Ecodan meets the MCS noise standard (42dB at the nearest neighbour's window) without difficulty, particularly if positioned with some distance from the boundary. However, for properties with very close neighbours or restrictive planning conditions, the quieter Daikin or Samsung models may have an advantage.

Installation and Indoor Components

Cylinder Options

Mitsubishi offers several cylinder options to pair with the Ecodan:

  • Ecodan Cylinder (?"EHST" range): Pre-plumbed cylinders in 150, 200, and 300-litre sizes, designed specifically for the Ecodan. These include an integrated backup immersion heater.
  • Pre-plumbed Hydrobox: A compact hydraulic unit without hot water storage, used with a separate unvented cylinder.
  • Third-party cylinders: The Ecodan is compatible with various third-party hot water cylinders, giving installers flexibility.

FTC6 Controller

The FTC6 is Mitsubishi's latest wall-mounted controller for the Ecodan range. It provides clear status information, scheduling, and weather compensation settings. The interface is functional though not as visually polished as the Vaillant sensoCOMFORT. It does the job well for most homeowners.

Installer Network

Mitsubishi has the largest heat-pump-specific installer network in the UK. Their installer training programme is well-established, and many installers have been fitting Ecodans for a decade or more. This depth of experience translates to better installation quality — the installer knows the product inside out, anticipates common issues, and can commission the system optimally.

Warranty

Mitsubishi offers a 5-year standard manufacturer warranty on the Ecodan range. This can be extended to 7 years through their Homeowner Promise programme, which requires installation by a Mitsubishi accredited installer and product registration.

The warranty covers all major components. Regular annual servicing is a condition of the warranty. Given the Ecodan's strong reliability record, warranty claims are relatively rare.

Pricing

Mitsubishi Ecodan unit prices (before installation) typically range from:

  • 4 to 5kW models: £3,500 to £4,200
  • 8.5 to 11.2kW models: £4,200 to £5,500
  • 14kW models: £5,500 to £6,000

Total installed costs including cylinder, controls, pipework, and commissioning typically range from £8,000 to £13,000. After the Boiler Upgrade Scheme grant of up to £7,500, out-of-pocket costs are typically £1,500 to £6,000.

The Ecodan sits in the mid-range for pricing — less expensive than Vaillant and competitive with Daikin. The combination of competitive pricing and proven reliability makes it a strong value proposition.

Ecodan vs Competitors

Ecodan vs Daikin Altherma 3

Daikin achieves slightly higher SCOP figures and lower noise levels. The Ecodan offers a larger UK install base, better real-world reliability data, and arguably better energy monitoring through MELCloud. Both use R32 refrigerant. The differences are modest — either is an excellent choice.

Ecodan vs Vaillant Arotherm Plus

Vaillant wins on refrigerant (R290 vs R32), maximum flow temperature (75°C vs 55/60°C), and SCOP. The Ecodan wins on price, noise (Ultra Quiet models are competitive), proven reliability, and installer familiarity. For older properties needing high flow temperatures, Vaillant has the edge.

Ecodan vs Samsung EHS Mono

Samsung is typically cheaper with lower noise levels. The Ecodan has a far longer UK track record and a larger service network. For homeowners who want proven reliability above all else, the Ecodan is the safer choice. For those prioritising value and quiet operation, Samsung is compelling.

Pros and Cons Summary

Pros

  • Most installed heat pump brand in the UK — unmatched track record
  • Excellent reliability and durability proven over 15+ years in UK 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 pricing — mid-range for the market
  • Wide range from 4kW to 14kW covering most domestic needs
  • Ultra Quiet models for noise-sensitive installations

Cons

  • SCOP slightly behind leading competitors (Daikin, Vaillant)
  • Standard models are noisier than the quietest alternatives (Samsung, Daikin)
  • Still uses R32 refrigerant — not yet transitioned to R290
  • Maximum flow temperature of 55-60°C may not suit the oldest, least insulated properties
  • FTC6 controller is functional but not as polished as Vaillant's sensoCOMFORT

Who Is the Mitsubishi Ecodan Best Suited For?

  • Homeowners who prioritise proven reliability and a low-risk choice
  • Properties in areas with excellent Mitsubishi installer coverage (most of the UK)
  • Moderately to well-insulated homes where 55°C flow temperature is sufficient
  • Homeowners who want good energy monitoring through MELCloud
  • Budget-conscious buyers who want strong value without sacrificing quality

For poorly insulated homes needing flow temperatures above 60°C, consider the Vaillant Arotherm Plus (75°C) or Daikin Altherma 3 H HT (70°C) instead. For more on choosing between brands, see our best heat pumps UK comparison guide.

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. It may not lead every specification category, but it is a strong all-round choice 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 Ecodan installations (from 2010-2012) are still running well, providing real-world evidence of the system's durability.

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). Use MELCloud to monitor your own system's real COP.

Is the Ecodan quiet?

The Ultra Quiet models achieve 42 to 45dB at one metre, which is acceptable for most installations. Standard models are 45 to 49dB — louder than the quietest competitors but still compliant with MCS noise standards in most settings.

Does Mitsubishi offer a heat pump with R290 refrigerant?

As of early 2026, the UK Ecodan range uses R32 refrigerant. Mitsubishi has R290 models in development but has not yet launched them in the UK domestic market. Check with your installer for the latest product availability.