Immersun 

Had a problem with an old model of the Immersun not diverting to heat the water. The unit was returned to Immersun for repair but was promptly found irrepairable. Immersun then gave me options for a replacement and my problems were quickly and efficiently resolved.
Excellent service from Immersun.

Very prompt & efficient resolution from Anish M MEng
Thank you

Rather belated for sure but hopefully none the less worth reporting. We installed a 4kw set of PVs on our house in June 2015 and decided on an Immersun unit to divert our unused energy to the hot water tank. We chose the Immersun product then over another popular contender at the first sight of its strong internal electrical design and componentry (and the then suspected - now proven - reliability).
The unit has worked well over the past 6+ years providing FULL 250L tanks of hot water on any clear and sunny day. A single hiccup on our system being a third party immersion heater within the tank giving up along the way. A new one fitted and away we go again with a clearly visible transference of 'spare green energy' being diverted into our own energy storage battery!
We would have no hesitation in recommending the Immersun Solar Power Diverter to anyone simply because it has just done it's job so well. Our one regret is that we did not get the iLink and 'Ap' at the outset for more convenient control and information - so that it what we are now about order.
On each submission to the Help Desk we have been provided with a Enquiry Ticket Number and have received prompt, succinct and polite help thus far.
We are considering a second set of PVs and if a diverter makes sense within the new configuration we would seriously consider contacting Immersun again!
HTH.....

Thank you Immersun Support for your help in steering me toward the right device for my system, and patiently answering all my questions.

I lost contact with my Immersun app. After several emails sending me ticket numbers (which I didn't understand) I finally heard from Anish who immediately sent me the link I needed to reconnect. All working really well again now. Many thanks Anish for your personal touch. It made all the difference.

After having our panels moved for a loft conversion we lost our connection to the Immersun remote monitoring. After raising a ticket on the support portal Anish provided a very detail response the very next morning and following his clear and comprehensive instructions we had it up and working again straight away. Great service, thank you Anish

Works well when it is working but mine didn't last. Will never pay for itself. Plus the cost of electrician to install remove when it goes wrong.

Immersun weren't interested in fault.

Have been running and Immersun product for several years and it is working faultlessly. Intelligently converting excess solar to hot water.

I was notified that there were server issues and to check my account was still ok. It wasn't so I raised a support ticket. Initial time to respond to the support ticket a little longer than I would have liked, however once I did get a response the detailed help provided was excellent. By following the detailed technical instructions provided my issue was fixed immediately. I couldn't have wished for a better support. Many thanks for dealing with my issue.

Spoke to Anish on a issue i was having with my unit
Anish is very understanding and extremely helpful and knowledgeable
Issue is going to be resolved and i can honestly say Anish is a credit to the group and must have the patience of a saint
On the unit it does work i just needed to iron out some programming it can capture the excess to the grid and convert it to heating our water can't ask more of it
Thank you Anish

Application used to work, but there are frequent outages and data losses. There is sometimes an email with some generic "Broken Server" bs to try explain the issues, more often nothing.

I can't login to Android app.
Android app appears to be gone from app store, no notification of support being pulled if this is the case.

They don't reply to emails (but they seem to reply to support tickets logged via support.immersun.co.uk)

Don't waste your money, very poor customer support and communications.

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Having read your reply:

Firstly thank you for the reply, I wish you had replied to the comms I have detailed below with such speed.

Here is a history of my experience so far:

29/08/2020 -> Outage
01/09/2020 -> Message that it was resolved

After this I was unable to login.
I emailed you at Tue, Sep 1, 2020, 6:29 PM, and you did not reply.

Mon, Oct 19, 2020, 5:59 PM -> Outage
Thu, Feb 4, 11:07 AM -> Outage

After this I was unable to login.
I emailed you at Tue, Feb 16, 9:38 AM, and you did not reply.

Thu, Mar 4, 12:47 PM -> Access restored
Thu, Feb 25, 5:44 PM -> Email from you saying some people could still not access
Linking to, Immersun/contact (cannot paste url) not -> support.immersun.co.uk

Fri, Apr 2, 5:11 PM -> Outage
Tue, Jun 1, 4:31 PM -> Server Crash you are racing to fix the problem
After this I was unable to login and emailed you on Sun, Jul 4, 10:53 AM

Wed, Jul 21, 3:29 PM -> Server Crash
You reset my password and I can now login

I note you never said Sorry once in these email, that must be in an email I missed. Review updated **

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Update as of 01/11/2021

Trustpilot have contacted me to confirm I am an Immersun owner, and to support all of the communications above I provided email print screens and my serial number.

Today, 01/11/2021, I got a reply to my support about another issues/outage (I cannot login again)

EMAIL BELOW ---->>>>
1 Nov 2021, 15:30 GMT

Hi Justin,

How can you still expect our help after your very unfair and erroneous review about us online, it is clear you are not appreciative of our support and past efforts to help you. Maybe MyEnergi (AKA 4Eco Ltd - the people who provided your older model of Immersun) can help you?

Kind Regards,
Immersun Support

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Update on 02/11/2021
I tweeted Immersun about the fact I still cannot login, and they blocked my account.

Shameful nonexistent customer service.

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Update on 04/11/2021

Immersun have tried to suppress this review by first claiming that my review was erroneous which it is not. They then tried to have it removed citing that I was promoting a competitor -> which I removed/redacted.

I have sent Immersun my phone number to discuss the issues and their conduct, but they will not call and there is no number I can reach them on? Lets talk, it's good to talk.

In relation to number 5 -> this is completely untrue. If you give me an email address or call me I am happy to show you the purchase. I have already shown Trustpilot proof of purchase. The Immersun unit was purchased and installed by Solar Electric (Irish Solar Company). I contacted Solar Electric and they are happy to reprint the invoice, however they told me that they do not do business with Immersun anymore due to poor customer service.

Again happy to jump on a call should you wish to try solve this problem, im still unable to login and you still refuse to provide a service.

iPhone app problems - An Immersun server crashed and my account access was disabled. To be fair it took a reminder ticket to be raised on the website a week later before action was taken - but then Anish acted very quickly and restored my account and no data had been lost :-)

Excellent and very prompt technical support if required. Thank you.

I use the immersun site to monitor my energy input and direct it once all my how water needs are met, to other heating/cooling devices by checking the live feed from anywhere in the world.
Recently the site had a major server fault that stopped me being on line for a week or so.
I contacted immersun who run the platform, by raising a ticket on the web site to help me.
Eventually I was able to email an employee named Anish directly.
He was very polite, very helpful, and very knowledgeable.
With his help I was back up and able to make the best use of my solar PV system again.
Well done Anish, thanks again.
Pat.

Excellent service everything explained very clearly, very happy with the service.

I recently had a new smart meter fitted by Shell Energy, since when my Immersun unit repeatedly flashed up an Error 4 fault regarding the sensor. I raised a ticket on support.immersun and had a call from Amish within 24 hours. He spent time taking me through various issues and fou d the sensor had been installed the wrong way round. 2 minute to change it round and Bingo! Free hot water again. Thank you Amish. My best ever support engineer walk-through experience; so clear and so patient. Top Guy

Anish from Immersun was beyond helpful in arranging repair to my previous model Immersun - am hopeful will be repairable as significantly cheaper than replacing the unit

Immersun time was BST-2 and reverted after I changed it. Support messaged me with instructions which worked. Great. Very happy

I had a problem with my Immersun, but they corrected the problem under warranty.
The 'ticket' system was a problem, but the service team and engineers were very helpful and kept me informed.
In summary, a good company with helpful staff, but the web communications system could be improved
This is my second Immersun and whilst it is easy to use and works well I would prefer a longer useful life.

My out of warranty 6 year old Immersun stopped working it seemed due to the fan failing (it had been squeaking and grinding for sometime before). Communication at every stage of contact with Immersun was excellent and the unit repaired and returned within 5 days which I think is outstanding. Up and running again now with a quiet, perfectly functioning unit. Thanks to Anish for his excellent work!