Would I Still Fit Ecodan in 2026?

What is a Mitsubishi Ecodan heat pump?

Ecodan is Mitsubishi Electric's heating heat-pump range. An air-to-water Ecodan takes heat from outdoor air and uses it to heat water for radiators or underfloor heating, and a suitable hot-water cylinder. It is not the same arrangement as an air-conditioning unit blowing warm air into a room.

The current Ecodan R290 range lists 5, 6, 8.5, 10 and 12kW models. Older Ecodans use different refrigerants and equipment, so an opinion about one generation is not a specification for every Mitsubishi ever installed.

Nor would I choose the size from the house's bedroom count. We need the heat loss, the water temperature the heating requires and the unit's output in cold weather. My heat-pump sizing guide explains that process.

Where I would choose Mitsubishi over another brand

I like being able to choose the external circulation pump and arrange the controls around the job. The pump moves heating water around the system. On the Mitsubishi installations I work with, that flexibility is useful when the heating is more complicated than a single circuit and cylinder.

Other manufacturers can serve complicated systems too. The point is that I know how to make these Mitsubishi arrangements work, and I am comfortable maintaining them afterwards.

There are also different equipment packages within Ecodan. For example, Mitsubishi offers an FTC7 packaged cylinder. Do not assume every Ecodan quote has the same indoor components or layout.

A recent installation with a log burner

On my most recent Mitsubishi installation, the property had a log burner connected to the heating. The arrangement used a 200-litre cylinder, with a coil acting as a heat exchanger for the log-burner side.

I chose Mitsubishi because I knew I could arrange it to work with that other heat source. That mattered more on this job than having my favourite controller.

It is a system that needs proper design, including how heat is managed if the electricity goes off. A solid-fuel appliance cannot stop producing heat as quickly as an electrically controlled heat pump. This is not a case of simply joining their pipes together.

Mitsubishi heat pump reliability and repairs

I have worked on Mitsubishi heat pumps around 20 years old that were still going. The older systems I have seen doing well were often simple: one heating zone, uncomplicated controls and faults we could identify and repair. That is my experience, not a promised lifespan for a new unit.

I have replaced compressors and fans. So no, I am not saying they never go wrong. I am saying the straightforward design, spare-parts support and technical telephone help have made them repairable.

I have not yet had to replace a Mitsubishi heat pump. I have repaired the ones I have worked on. That is a useful distinction when someone asks whether an older unit must be scrapped.

It still needs an assessment. We look at the actual fault, the condition of the rest of the equipment, whether the right parts are available and what the repair will cost. Age alone is not enough to make that decision.

A lot of heating faults are also outside the outdoor unit. A circulation pump, valve or other system component can stop the heating working without the heat pump itself being beyond repair.

How efficient is a Mitsubishi heat pump?

In my experience, Mitsubishi delivers respectable efficiency, but I would not choose it on the assumption that it will produce the lowest electricity bill of every brand. The heat loss, radiator output, water temperature and commissioning all matter. A brochure efficiency figure cannot tell you what your particular installation will achieve.

On a straightforward system, I like the integrated pump control offered by the Vaillant and Viessmann arrangements I normally install. On a more complicated job, Mitsubishi's flexibility over the external pump and system arrangement can be more useful to me.

That does not mean every external pump is uncontrolled, or that every generation of Ecodan has identical capabilities. The actual pump, controller and configuration need checking. I would not turn that difference into a made-up percentage saving.

I also do not have a like-for-like set of monitored R290 installations that proves a precise ranking between those brands. My recommendation is based on the systems I install and support, not a claim to have tested every model against every other one.

For the things that affect the bill, see my heat-pump running costs guide. Getting the design and settings right is more useful than comparing two headline efficiency numbers measured under different conditions.

Ecodan controls: solid, but not my favourite

The Mitsubishi controls I use are straightforward in what they let me do: weather compensation, fixed water temperature, and room-temperature control using an appropriate controller or sensor. Which arrangement we use depends on the system. Basic third-party on/off controls are not the same thing as giving the heat pump indoor-temperature feedback.

I find the weather-compensation curve reasonably easy to set on the controller. At handover, I often take a video of myself changing the customer's settings and send it to them on WhatsApp. It is easier to follow a video of your own controller than remember everything from installation day.

My criticism is that useful running information is buried in the installer settings. The controls do the job, but that part is not particularly friendly for someone who wants to understand how their heating is performing.

The newer FTC7 controller has a colour touchscreen, and Mitsubishi offers MELCloud app connectivity. To me, the newer presentation still feels more like a refresh than the larger change I had hoped for. Check which controller and app your proposed equipment uses, especially when comparing it with an older installation.

My guide to heat-pump controls explains the difference between weather compensation, room feedback and simple thermostats.

Mitsubishi heat pump cost and noise

Price is not usually the deciding factor for me

In the jobs I quote, there is not normally a huge price difference between Mitsubishi and the Vaillant or Viessmann alternatives I would consider. Mitsubishi can come in slightly cheaper, but I would not promise that for every model or installation.

Compare the whole proposal: cylinder, pumps, controls, any radiator changes, electrical work and commissioning. A cheaper outdoor unit is not necessarily a cheaper finished heating system. I choose Mitsubishi because it suits the job, not because it wins a small difference on an equipment price list.

Reasonably quiet, rather than a reason to buy it

I find Mitsubishi heat pumps reasonably quiet. I have not had customers complain about noise after the Mitsubishi installations I have carried out. That does not make every position suitable, or prove it is the quietest brand.

We still need to choose the location properly and assess sound at neighbouring properties. The model, operating conditions and installation all affect what someone hears. There is no useful single noise number for the entire Ecodan range.