Quick answer: The Mitsubishi Ecodan is one of the best-proven air source heat pumps you can buy in the UK. The current Ecodan R290 monobloc range comes in 5kW, 6kW, 8.5kW, 10kW and 12kW sizes, runs on natural propane refrigerant, reaches flow temperatures of up to 75°C and is guaranteed to operate down to -25°C. It is also made in Livingston, just along the M8 from us. Expect a typical installed price of roughly £7,000 to £12,000 before grants, with up to £7,500 available from Home Energy Scotland. We’re MCS-certified heat pump installers at The Edinburgh Boiler Company, and the Ecodan is one of the heat pumps we’re asked about most, so this review is written from an installer’s point of view.
We fit and service a lot of heat pumps across Edinburgh, the Lothians, Fife and beyond, and the Ecodan is a name customers recognise straight away. That familiarity is earned. Mitsubishi Electric has been building heat pumps for UK homes for well over a decade, and the latest R290 models are a real step forward. In this review I’ll walk you through the models, the efficiency figures from Mitsubishi’s own data sheets, what you can expect to pay, and how an Ecodan copes with a proper Scottish winter.
Mitsubishi Heat Pump Review: At a Glance
Here’s the short version. The figures below come from Mitsubishi Electric’s UK product pages and data sheets for the Ecodan R290 monobloc range.
| Feature | Mitsubishi Ecodan R290 |
|---|---|
| Brand | Mitsubishi Electric |
| Main UK range | Ecodan R290 monobloc air source heat pump |
| Sizes | 5kW, 6kW, 8.5kW, 10kW, 12kW |
| Refrigerant | R290 (propane), very low global warming potential |
| Maximum flow temperature | Up to 75°C |
| Operating range | Guaranteed down to -25°C outdoor temperature |
| SCOP at 35°C flow | 4.39 to 4.71 (ErP A+++) |
| SCOP at 55°C flow | 3.38 to 3.51 (ErP A++) |
| Noise | Quiet Mark accredited |
| Controls | FTC7 controller with colour touchscreen, MELCloud app |
| Where it’s made | Mitsubishi Electric’s factory in Livingston, West Lothian |
| Typical installed cost | Around £7,000 to £12,000 before grants (fixed after survey) |
| Home Energy Scotland grant | Up to £7,500 (£9,000 with rural/island uplift) |
| Warranty | 3, 5 or 7 years depending on your installer’s Mitsubishi status |
| Best for | Most Scottish homes, including older properties with existing radiators and microbore pipework |
Is a Mitsubishi Ecodan Heat Pump Worth It?
Yes, for most homes a Mitsubishi Ecodan is well worth it. It’s a mature, well-supported product with strong efficiency figures, a high flow temperature that suits older Scottish houses, and a factory on our doorstep.
What I like most about the R290 Ecodan is that it removes a lot of the old worries people had about heat pumps. A 75°C flow temperature means it can work with radiator systems that would have struggled with earlier low-temperature units. Mitsubishi also says it’s fully compatible with existing microbore pipework, which matters a lot in the 1960s and 1970s houses we see across Livingston, Dalkeith and Kirkcaldy. That doesn’t mean every radiator will be fine as it is (more on that below), but it often means less disruption than people expect.
The Livingston connection is a nice bonus too. Mitsubishi Electric’s Livingston factory has been making heat pumps since 2009, employs more than 1,800 people, and the Ecodan R290 was its five-millionth product off the line. For a Scottish homeowner, buying a heat pump built about 15 miles from Edinburgh city centre feels like a sensible choice.
Pros and Cons of Mitsubishi Ecodan Heat Pumps
| Pros | Cons |
|---|---|
| Flow temperatures up to 75°C, so it suits many existing radiator systems | Running at high flow temperatures lowers efficiency, so design still matters |
| Guaranteed operation down to -25°C | The full 7-year warranty depends on your installer’s Mitsubishi partner status |
| Natural R290 refrigerant with a tiny global warming potential | Monobloc units are a fair size (around 1,050mm wide), so you need a sensible spot outside |
| Strong SCOP figures, A+++ at 35°C flow | Unclaimed Trustpilot profiles with very few reviews, so there’s little independent review data |
| Quiet Mark accredited | The smart features depend on a good Wi-Fi signal reaching the controller |
| Made in Livingston, with a long UK track record | Upfront cost is still higher than a like-for-like boiler swap before grants |
| Works with existing microbore pipework and all Ecodan cylinders |
How Efficient Are Mitsubishi Ecodan Heat Pumps?
Very efficient. On Mitsubishi’s data sheets, the Ecodan R290 range has a SCOP of 4.39 to 4.71 at a 35°C flow temperature (ErP A+++) and 3.38 to 3.51 at 55°C (ErP A++).
SCOP stands for seasonal coefficient of performance. In plain terms, a SCOP of 4.5 means you get about 4.5 units of heat for every unit of electricity the heat pump uses, averaged over a heating season. The lower the flow temperature your radiators need, the higher that number climbs.
| Model | Heat output at -7°C / 35°C flow | SCOP at 35°C | SCOP at 55°C |
|---|---|---|---|
| PUZ-WZ50VAA (5kW) | 5.2kW | 4.42 | 3.38 |
| PUZ-WZ60VAA (6kW) | 6.2kW | 4.39 | 3.43 |
| PUZ-WZ85 (8.5kW) | 8.5kW | 4.47 | 3.51 |
| PUZ-WZ100 (10kW) | 10.0kW | 4.62 | 3.48 |
| PUZ-WZ120 (12kW) | 11.5kW | 4.71 | 3.51 |
One thing I always point out: the output figures above are measured at -7°C outside. That’s a good sign the units hold their capacity in genuinely cold weather, which is exactly what you want during a January cold snap.
So what does that mean for your bills? Using the Ofgem price cap for 1 October to 31 December 2026, electricity is around 26p per kWh. With a SCOP of 3.5 (a typical figure at 55°C), each kWh of heat costs roughly 7.4p. At a 35°C flow and a SCOP of 4.5, it drops to around 5.8p. Compare that with gas at around 8p per kWh through a 90% efficient boiler, which works out at roughly 8.9p per kWh of heat. Real-world results depend on your home, your radiators and your tariff, and a heat pump tariff can make a big difference. Our guide to what a heat pump costs to run in Scotland goes into more detail, including tariffs.
Mitsubishi Ecodan Air Source Heat Pump Models
The main Ecodan range for UK homes is now the R290 monobloc, available in five sizes from 5kW to 12kW. Mitsubishi is phasing out its older R32 Ecodan units in Europe and replacing them with the extended R290 range.
A monobloc heat pump keeps all the refrigerant inside the outdoor unit, so only water pipes run into your home. That makes installation tidier and means no refrigerant pipework inside the house. The 5kW and 6kW R290 models launched in October 2023, and the 8.5kW, 10kW and 12kW models followed in 2025.
| Model | Refrigerant | Sizes (kW) | Max flow temp | Notes |
|---|---|---|---|---|
| Ecodan R290 monobloc (PUZ-WZ50 / WZ60) | R290 | 5, 6 | 75°C | Launched October 2023. 1,050 x 480 x 1,020mm, 89kg. Good for flats, smaller houses and well-insulated homes |
| Ecodan R290 monobloc (PUZ-WZ85 / WZ100 / WZ120) | R290 | 8.5, 10, 12 | 75°C | Added in 2025. 1,050 x 480 x 1,040mm. Suits larger family homes and older properties with higher heat loss |
| Ecodan R32 monobloc (previous range) | R32 | Various | Varies by model | Introduced 2017 and now being phased out in Europe in favour of R290 |
All R290 models share the same -25°C to +46°C operating range and work with every Ecodan cylinder. Choosing the right size isn’t guesswork. We carry out a room-by-room heat loss calculation during your survey, and if you want to understand how that works first, have a read of our guide to sizing a heat pump for a Scottish home.
Controls: The Ecodan is run by Mitsubishi’s FTC7 controller, which has a colour touchscreen, energy monitoring that shows energy consumed and produced, a built-in quiet mode, and is Smart Grid and PV ready. Pair it with the MELCloud Home app and you can adjust settings remotely from your phone, tablet or computer, keep an eye on energy use, share access with family and receive error alerts. It also works with Alexa through customised scenes.
Want to know which Ecodan size your home needs? That comes from a proper heat loss calculation, not guesswork. Book a free heat pump survey and we’ll work it out for you.
How Much Does a Mitsubishi Ecodan Heat Pump Cost?
A typical Mitsubishi Ecodan installation costs somewhere around £7,000 to £12,000 before grants. That covers the heat pump, a hot water cylinder and labour. Larger homes, or jobs that need several new radiators, can come in higher.
Those are typical figures only. Your actual price depends on the size of heat pump you need, the cylinder, how much of your radiator system needs upgrading and how tricky the pipework run is. We fix your quote after a survey, so there are no surprises later.
The good news is that most Scottish homeowners won’t pay anything like the full amount:
- Home Energy Scotland grant: up to £7,500 towards an air-to-water heat pump like the Ecodan, rising to £9,000 if you qualify for the rural and island uplift.
- Home Energy Scotland loan: an optional interest-free loan of up to £7,500 on top of the grant.
- Warm Homes Loan Scheme: the UK Government’s new scheme offers low and zero-interest loans of up to £20,000 for air-to-water heat pumps, with some loans running up to 30 years. It can be combined with Home Energy Scotland grants, and we’re proud to be part of it. You can read more in our Warm Homes Loan Scheme update.
A couple of rules to bear in mind. You must apply to Home Energy Scotland and receive a written offer before any work starts, and both the installer and the product must be MCS certified. The heat pump must also provide all of your heating and hot water. Our Home Energy Scotland grant and loan guide walks through the whole process step by step.
You may have heard about the £7,500 Boiler Upgrade Scheme. That’s for England and Wales only, so in Scotland it’s Home Energy Scotland you’ll be dealing with.
Warranty: Mitsubishi’s warranty depends on who fits your Ecodan. A standard account holder installation gets 3 years, an Accredited Ecodan Installer gets 5 years, and a Heating Business Solutions Partner gets 7 years. Cylinders and ancillaries carry 3 years at every level. The homeowner guarantee card must be returned within 30 days of commissioning, otherwise cover drops to 12 months, so always ask your installer to confirm this has been done.
What Property Types Suit a Mitsubishi Ecodan?
The Ecodan suits most property types, from flats and bungalows to large detached homes. The 75°C flow temperature makes it a particularly good fit for older Scottish properties that still have their original radiators.
- Stone-built and Victorian homes: Thick stone walls hold heat well but can be hard to insulate. A higher flow temperature gives you more headroom here, and the 10kW and 12kW models cover larger heat losses.
- 1960s to 1980s semis and terraces: Very common in towns like Livingston, Bathgate and Kirkcaldy. Microbore compatibility is a real plus in these homes.
- Bungalows and smaller homes: The 5kW and 6kW models are often all that’s needed, especially after loft and cavity insulation.
- New builds and well-insulated homes: These can run at low flow temperatures, which is where the Ecodan really shines on efficiency.
- Tenement flats: Possible, but the outdoor unit needs a suitable location and you may need permissions. We’ll talk you through it at survey.
Here’s my honest advice, though. Just because an Ecodan can reach 75°C doesn’t mean you want it running that hot all winter. The lower the flow temperature, the cheaper it is to run. That’s why we’ll often recommend upgrading a few key radiators so the system can run cooler and more efficiently. Our guide on whether you need new radiators for a heat pump explains how we decide. If you’re curious about why higher flow temperatures matter so much, our piece on high temperature heat pumps is a good next read.
Mitsubishi Ecodan Maintenance Requirements
An Ecodan needs an annual service by a qualified heat pump engineer, plus a little light care from you through the year. Servicing keeps it efficient and protects your warranty.
Mitsubishi’s warranty terms exclude failures caused by inadequate or no maintenance, and annual servicing is specifically required for packaged cylinders. So skipping the service is a false economy.
A typical annual service covers:
- Checking system pressure, flow rates and the expansion vessel
- Cleaning the magnetic filter and strainers
- Inspecting the outdoor unit, fan and coil
- Checking the cylinder and safety valves
- Reviewing controller settings and any logged error codes
- Making sure the system is running at the right flow temperature for your home
Between services, keep the area around the outdoor unit clear of leaves, snow and plant growth, and don’t cover it. If you’d like us to look after all of that for you, our heat pump aftercare plans take the hassle away.
What Are the Ratings for Mitsubishi Ecodan Heat Pumps?
Mitsubishi Electric doesn’t run an active UK Trustpilot profile for Ecodan, so there’s very little independent review data to go on. Most of the Ecodan’s reputation comes from installers and its long track record in UK homes.
Trustpilot
The Mitsubishi Electric profiles on Trustpilot are unclaimed and have only a handful of reviews each. Trustpilot itself notes the company hasn’t invited customers to review, so the scores aren’t really representative either way. In practice, the reviews that matter most are those for your installer, because the quality of the design and fitting has a bigger effect on how your heat pump performs than the brand on the box.
Which?
Which? publishes brand scores for heat pumps, but its full results sit behind a membership paywall and we haven’t quoted a figure here. If Which? ratings are important to you, it’s worth checking the latest results directly on the Which? website before you decide.
How Does Mitsubishi Ecodan Compare?
The Ecodan sits right alongside Daikin and Vaillant as one of the three heat pump brands we’re asked about most. All three are excellent, and the right choice usually comes down to your home and budget.
- Mitsubishi Ecodan vs Daikin: Daikin’s Altherma range is broad, with most models on R32 and the newer Altherma 4 on R290. The Ecodan’s whole current range is on R290 with a 75°C flow temperature. See our Daikin heat pump review for the full picture.
- Mitsubishi Ecodan vs Vaillant: Vaillant’s aroTHERM plus also uses R290 and reaches 75°C, so the two are closely matched on paper. Read our Vaillant heat pump review to compare them side by side.
Torn between the Ecodan and another brand? Speak to us. We’ll compare the options for your actual home and budget, with no hard sell, and help you claim your Home Energy Scotland grant. Arrange your free survey here.
Is a Mitsubishi Ecodan Right for You?
For most homeowners in Edinburgh and across central Scotland, a Mitsubishi Ecodan is a strong, safe choice. Here’s how I’d sum it up.
Choose Mitsubishi Ecodan If…
- You live in an older home and want to keep as many of your existing radiators as possible
- You have microbore pipework and want to avoid ripping it all out
- You want a heat pump with a proven record in cold weather
- You like the idea of a natural, low global warming refrigerant
- You’d like to monitor and control your heating from your phone
- Buying a heat pump made in Scotland matters to you
Don’t Choose Mitsubishi Ecodan If…
- You have very limited outdoor space and can’t site a unit around a metre wide
- You want air-to-air heating or a hybrid with a gas boiler, as these don’t qualify for the Home Energy Scotland grant
- You’re not prepared to have your home properly surveyed and possibly upgrade a few radiators
- Your installer can’t offer you Mitsubishi’s longer warranty and that’s a priority for you
Get a Free Heat Pump Quote From The Edinburgh Boiler Company
If you’re thinking about a Mitsubishi Ecodan, the best first step is a proper survey. As one of Scotland’s leading MCS-certified heat pump installers, we’ll measure your home’s heat loss, check your radiators and pipework, find the best spot for the outdoor unit and give you a fixed quote with no obligation.
We cover Edinburgh, Musselburgh, Dalkeith, Penicuik, Livingston, Bathgate, Linlithgow, Falkirk, Stirling, Dunfermline, Kirkcaldy, Perth, Glasgow and the Borders. We’ll also help you with your Home Energy Scotland application and explain how the Warm Homes Loan Scheme could spread the cost.
Book your free heat pump survey today, or find out more about our heat pump installation service.
Mitsubishi Ecodan Heat Pump FAQs
Does a Mitsubishi Ecodan qualify for the Home Energy Scotland grant?
Yes. The Ecodan is an air-to-water heat pump, so it can qualify for up to £7,500 (or £9,000 with the rural uplift), as long as it’s installed by an MCS-certified installer, provides all your heating and hot water, and you get a written offer before work starts.
Does a Mitsubishi Ecodan work in Scottish winters?
Yes. Mitsubishi guarantees the Ecodan R290 will operate down to -25°C, and its heat output figures are measured at -7°C outside. It is also built in Livingston, so Scottish weather is very much home turf.
How long does a Mitsubishi Ecodan last?
With annual servicing, a well-installed Ecodan should give you many years of reliable heating. Most air source heat pumps are designed to last around 15 to 20 years, and our guide on how long heat pumps last covers what affects that.
What’s the difference between R32 and R290 Ecodan models?
R290 is a natural refrigerant (propane) with a far lower global warming potential than R32. The R290 Ecodan also reaches flow temperatures of up to 75°C. Mitsubishi is phasing out its R32 Ecodan units in Europe and replacing them with the R290 range.
Is the Mitsubishi Ecodan noisy?
No. The Ecodan R290 holds Quiet Mark accreditation, and Mitsubishi’s data sheets list a sound pressure level of 40dB(A) at one metre. Placement still matters, and we’ll make sure it meets permitted development noise limits for your neighbours.
Can I control a Mitsubishi Ecodan from my phone?
Yes. With the MELCloud Home app you can adjust settings, check energy use, get error alerts and share access with family members from anywhere with an internet connection.
Where are Mitsubishi Ecodan heat pumps made?
The Ecodan R290 is made in the UK at Mitsubishi Electric’s factory in Livingston, West Lothian, which has been producing heat pumps since 2009.
