Thanks, @hcas.

When I tried to take a look at Melcloud Home, it told me it's only for aircon units. Do you know of anyone yet with a heat pump who's using the new Mitsi app?

I had to de-register my current connection and sign up again (UK) on the web app (play store isn't yet available in the UK)

But there are official migration guides on YouTube for the likes of the Netherlands which you could try the steps from within MELCloud 

@majordennisbloodnok The migration hasn't started in the UK, so not really.

We've seen it in other places in Europe. The "new" Melcloud Home app isn't so different from the current Melcloud app based on what I've seen.

I have now managed to tweak a few DIP switches to get all the required data through now and I have to say Im really impressed with the dongle (Mitsubishi Ecodan Heat Pump to MQTT/Home Assistant and MELCloud WiFi or Ethernet) and the data displayed in Melpump. For the price its a real bargain. Here are some screen shots.

It has really diagnosed some of the issues at this facility so that I can go about fixing them.

@editor would you like a write up of this for your articles?

@bontwoody Very interesting indeed. I have started a trial with HavenWise and I think we are moving forward, but I am not entirely convinced at this stage and there are some aspects that I am not so keen on.

Could you clarify something for me please? As I understand it HavenWise collects your data and then uses this to manage the system with algorithms that are more sophisticated than MelCloud can provide through weather compensation, etc.

On the other hand, does MelPump just provide you with rather more detailed information for you to carry out the management more effectively, or do they also do management?

I love the idea of having more information, but I am not at all sure I can devote much more time to acting upon the additional data.

Thanks @bontwoody!

It's worth noting that you did purchase the Home Assistant version, but converted the firmware to the tailored "MELPump" firmware (which is easier to link with the App and gets automatic OTA updates)

It's straightforward to do; however there is a separate listing so it can ship it pre-installed if others are interested.

@davidalgarve Im only just beginning to scratch the surface David but it seems that there are some energy saving features in Melpump although maybe not as advanced as some of the other options like Havenwise and Homely. I will screenshot them below:

Posted by: @davidalgarve

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On the other hand, does MelPump just provide you with rather more detailed information for you to carry out the management more effectively, or do they also do management?

Both,
There are options for Eco & Dynamic Tariffs and Smart Solar modes etc. but probably not to the same level as hands-off as Havenwise

Then also the powerful data to root cause specific issues, look into underlying design and share with your installer/service engineers etc. to make adjustments

I read this thread with some interest a couple of weeks ago, but was initially put off by the prospect of having to open up the heat pump and fiddle about with installing a connector within it.

Having returned to it yesterday and taken a closer look at the MelPump website, I realised that there's a level of access available that doesn't require this, and it will utilise the data available in MelCloud to report information in a more user-friendly format.  I was also concerned that, being an existing customer of Havenwise, which I use to control the heat pump, that the two would somehow interfere with each other, as MelPump also offers functionality to fine-tune the performance of the pump through the app.

Having re-assured myself that this wasn't the case, I've now commenced an initial 30 day trial of MelPump, as a user accessing just the MelCloud data within it.  First impressions are good, and the availability of information is much more accessible than within MelCloud, as expected.  On the basis of what I've seen so far, I suspect that the annual subscription cost will likely be a worthwhile investment for me, even without the additional data available from the dongle.  That's a step further that I'll need to consider in due course, with my main initial concern being the ease of connecting it and any potential impact on Mitsubishi's 7 year warranty that doing so might create, should an issue arise with the heat pump itself.

@sheriff-fatman Interesting because I am considering something similar. I am still in the trial period with HavenWise and it was a disappointing start with a long period before the performance seemed to approach my previous weather compensation levels. Of course, comfort is one thing and running costs are another. Currently, I am not seeing any improvement in the ability to easily collect data to evaluate performance and it would appear that MelPump would offer much more in this direction, but give less direct control.

I can't see me paying two subscriptions, but I will find it hard to decide between the two.