Mitsubishi Ecodan 14Kw Air Source Heat Pump review

A review and my personal thoughts on our Mitsubishi Ecodan air source heat pump, which we've had installed for almost a year. Learn what we like and don't like about it.

Sorry about the focus during the video, not sure what happened there.

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[trapperraptor]

I installed my7kw heat pump in my new pasif sips 3 bed detached single story house and its only for the underfloor heat, , , , no tank its direct to the floor, , , , works like a

[andrewalexander]

We have one and very happy with it, coming from a 1930’s style gas powered heating then moving to a newer six year old property which one was fitted we were sceptical. After a year being here we are very happy with it, but don’t be fooled to paying out for one if you live in a traditional British double brick house you will be cold. It works best with newer insulated homes and underfloor heating with larger radiators upstairs. Also make sure it’s installed by a competent company who know what they are doing. Mitsubishi are the best don’t use the online app it’s on 24/7 has to be to work properly, you can’t switch it on and off like gas central heating.

[andrewcoultas]

A very good review of your system. We have all the same issues, with our almost identical system; right down to it being too big to close the airing cupboard doors and it waking up 'er indoors if it comes on in the night. One trick, you can poke around in the menu options of the control box and switch off the legionnaires protection just by removing a tick. Of course you should only do this if you are confident your water tank regularly gets hot enough to kill any diseases! The internet app really is pants - but our installer gave us a portable battery powered thermostat box which is a game-changer. It's right by my chair and guarantees I'm cozy.

[martinbanfield]

Hello
It is very easy to switch off the frost function and the legionella process
If the glycol protects to minus 15 degrees C, you can adjust the temperature which you have set to 5 degrees C down - it will go to 3 followed by an asterisk - the asterisk indicates that the frost function has been deactivated
However, you must be sure of your lowest outdoor temperature and the freezing point of the glycol
Normally the heat pump will be running when it is cold outside but there could be a power cut; in which case the unit relies on the antifreeze
Legionella is simple to switch off, you just untick the box - however, you have to be sure that the water has been securely pasteurised by keeping an eye on it
If you check out the you tube video of setting up the controls on this system, I think it advises 60 degrees C for 1 hour once a week - that means not using the water for that period as this would cool the cylinder
I have never had a complaint about the pump noise but you may be able to reduce this noise by changing the pump or pumps speed/s
Changing the speed will affect a number of things so you would need to check the flow rates too
Hope this is helpful, I cannot give you my contact details on a public site
Best to call Mitsubishi helpline - they should be able to go through what I have mentioned here
Also, you need to be certain that the glycol freezing point is as the commissioning document shows - some installers can be lazy and not put enough glycol in the antifreeze mix
This is checked with a propylene glycol refractometer - about £30 I think

[clotencloten]

Super review. Mine (14, 4kW) will be installed next month, however, I opted for a direct condensation buffer tank of 850L. So the inner Ecodan unit becomes obsolete. The control unit will be a non-Mitsubishi universal device.

[joewentworth]

You might find the pumps are loud because of how hard they work with your microbore. Once that is upgraded you can turn them down. We have it in a spare room with two pumps. Can't hear either when you are next to them. It will get better!

[kennethausten]

I installed a 15 watt bulb under the frost stat to keep the temperature above 5c as the boiler was running all day as it was in the cold attic. I switched it on from below when needed. The bills were huge.. That was on the gas boiler. Thanks for the review. It's made me aware..I need to wait another 5 years I feel.

[pawelewandowski]

Thanks man! Was just about to order a similar Mitsubishi pump but, you made me change my mind :) I'm all after having either, a nice app, or some open APIs to get some automations running. Of course, the unit also is required to be reliable which at least seems to be Mitsubishi's strong characteristic.
There are just so few critical reviews out there.

[alanclarke]

I have an ecodan and solar thermal - we have disabled the legionella cycle having seen that solar thermal will get the temperature up high enough on odd days through the winter as well as continuously through the summer. I've never seen a scientific basis for the weekly cycle - but did find research suggesting legionella took 2 years to establish in a domestic HW system, so actually even if you don't it that hot over winter it is probably fine

[paulmcquaid]

Thanks. This video along with all of the corresponding comments are realy useful. 👍

[stephendoherty]

Not many HP users also have rooftop solar so Mitsu does not integrate that. It should be something that could be changed with a software update that would use the water temp sensors to record the heat in the cylinder. As for the frost protection, I presume even with the glycol (that breaks down over time) that the 5 deg setting is there as the temp can often fall faster to sub zero. Also this water is flowing very slowly and therefore the water can freeze faster than higher flow water in pipes.

[elmafudd]

This was more than very useful thank you for your time. At the momment solar thermal seems to be a better option with a larger tank. Either that or all this stuff needs to be in an outside space and just the underfloor heating pipes need to access the house.

[Charlotte-fikz]

Thanks for a sensible and easy to listen to review of ASHPs. I'm just starting to look into it as my LPG boiler is increasingly unpredictable. It's so hard to know who to speak to for site / property specific advice. I'm still not sure if our property is suitable. Could be an expensive mistake!

[craigturner]

In view of your comments I think I might consider the Mitsubishi heat pump, but try and opt for the Mixergy tank system. From what I've read and viewed the Mixergy appears to have much better control functionality. Great review.

[OnceIcaughtafiash]

Thanks for the detailed review here! Just wondering... has there been any firmware updates or anything since? Or are this issues you've had still present?

[tonykelpie]

Our ECODan is very quiet. We don’t know if it is on if we stand close

[andylefevre]

Thanks for the review very useful! Just wondered how far from the house your heat pump is? - looks like you have a lot of insulated pipework needed just to get to the house. I will have the same issue with the pump noise from the airing cupboard - good highlight; I will look into having my pumps put elsewhere. I didn't understand the issue with the anti-legionella tank heating; if your solar cells heat the tank to a sufficiently high temperature then the Mitsubishi heating cycle shouldn't even activate because the tank heating sensor will be telling the controller the temperature is already high enough - is that not the case?

[airconyou]

All your concerns have an answer but there is one: the defrost mode is happen because the evaporator coil behind the pump can freeze at 3 degrees outside temperature, nothing to do with the glycol in the pipes.

[stephencoulthard]

With you on the internal pump noise Vs the outdoor unit everyone is worried about

[robertoleszek]

Water does freeze from 4 deg Celsius and below

The heat pump does appreciate solar heating. It does heat up from the the current temperature up.
So if there is 200l of 30deg Celsius then heat pump will heat from 30 to 60°C
Insted from 5 ° to 60° (without solar thermal)