Immersun 

My power diverter broke down after 18 months and despite claiming warranty for weeks they've now told me they creased trading on 13/1/26. Why they didn't tell me this when I first raised the issue instead of weeks down the line, with no hot water for 2 months, is beyond me. If say don't touch with a bargepole but you won't be able to anyway now. Just look out for any other company started by the same directors and avoid.

Very bad customer service. You never ever actually talk to anyone how ever many times you try.
Bought one it went wrong 6 months later. They finally mended it after about 7 weeks of sun shine. It went wrong again after another 6 months they then said we needed a new one as they couldn’t mend it this time. And it wasn’t under guarantee any more after just over one year and it going wrong twice. They are impossible, I would never use them again. But I do have to say our first one lasted for 10 yrs and was wonderful.

EV car charger died a nightmare to get it picked up for replacement by their carrier DX and now they are ignoring any attempt at contacting me

I sent an online query regarding a fault on my Immersun and I got an immediate ticket number a reply the following day. I inherited the Immersun unit when I bough my house and it was bought from a company which has since gone bankrupt. The company were unable to help me to fix the fault but I sent questions to a guy called Anish M and he gave me loads of very useful information about how the unit works (it's a mystery to me, they system seems very complex and I've given up trying to understand it!) and he reassured me to carry on with the current unit as it is actually working OK despite the minor fault. Thank you Anish for your honest and informative responses, that is what I call great customer service!

We have had 2 Immersun boxes in 10 years. The first failed after 8 years and the second after only 2 years. The warranty is only 12 months. There are no technicians who can undertake repairs on site so your only option is to pay for an electrician to disconnect the box, send it back to Immersun and pay for repair, then pay an electrician to reinstall it. Either that or buy another new box. Given our latest box only worked for 2 years it's ended up costing us money, not saving it!

I’ve had a very bad experience with this company’s drives. My first one broke after 1.5 years, and even though it was out of warranty, I was assured the “new and improved” model would be more reliable. Unfortunately, the replacement I bought in November 2024 has already failed.

The fan stopped working, the unit started smoking in the middle of the night, and I had to shut it down. This left my family without hot water — with a newborn at home, that’s a serious problem.

Not only has this product been unreliable, it’s also a safety hazard. Two failures in such a short time is unacceptable. I cannot recommend this product or company based on my experience.

Sent in my question to immersun had a swift response with ticket number the very next day a detailed email with link and detailed steps and guidance to resolve my issue
Wonderful service can’t thank you enough

We had a problem between our Immersun and Immersun Link whilst trying to remotely control the Immersun. Having raised a Ticket on a Sunday, they responded on the Monday, seeking additional information (photos and screen shots). They came straight back with comprehensive instructions. Following those, I was able to diagnose and resolve the problem. Great customer service, thank you.

I've am a great fan of the Immersun solar diverter, I've recently replaced my old unit after it diverted 10000 KwH of power over 10/11 years. Faultless performance so ordered a new one without hesitation.
I ordered it later on a Friday so it didn't come till Wednesday. Easy swop over and setup with the new one working in short order.
My emails were answered promptly by Anish and I even sent my old unit back for recycling.
Well done Immersun.

Bought an Immersun EV charger via one of their ebay outlets.
Using it now for two years without an issue, until one day the app lost connection and I couldn't connect the charger to my phone.
Raised a ticket via the Immersun website and within 24 hours they had reset my account and gave me clear instructions how to move forward.
The whole process of the re-connecting took a couple of minutes and all is good again.
- Good response time
- Clear instructions
- Nice looking unit
- Works without issue for 2 years now
- From time to time they have great offers (mine was 50% off)
- Sold Immersun inverters in the past when i was involved with solar panels so know the quality is there.

Immersun U.K. were extremely helpful to me when I couldn’t get suitable help from the Irish Company who installed the system. Initially I was told, I needed a plumber. I did not think that was the answer. They seemed to just want me to buy a newer different system and wouldn’t answer further questions by email or phone. I decided to contact Immersun UK on line and I very quickly received helpful advice which solved the issue for me. If I have any further problems I will contact Immersun straight away The problem did not need a plumber. Hats off to Immersun

I sent one message asking for advice because after a power outage it wouldn’t reboot the reply came back within two hours with a message advising me on a certain route and when I followed it the immersun diverter came to life. Five stars without a doubt

The Ev charger failed literally on the day after the warranty run out which was a measly 1 year, not long for a glorified power point really is it, baring in mind I had the kit sat in garage a couple of weeks prior to installation when I got in touch with a get a token and join the queue for a email from support team, zero phone calls happening, was finally informed my years warranty was up so tuff, substandard looking kit, terrible customer service stay away.

GO WITH. CAUTION I Purchased my IMMERSUN unit just under a year ago with a thing called iLink. The main unit seems to function okay however it needs to be constantly reset to start properly. Also the ilink which I am led to believe we will allow me to monitor the device on my iPhone just does not set up properly. I have TRIED TO CONTACT them now over a number of days with no response. I suspect I’m dealing with a computer, bot - I would suggest strongly that unless you can verify if you are to purchase that you are going to have contact with the company then look elsewhere. It’s a very expensive piece of equipment and in reality. I don’t think it’s underpinned by the quality of backup or technical support. I think I’ve given up with it and it’s less than a year old. I do feel now looking at the reviews that there were too many five stars. I was LED TO believe that it was manufactured in the UK however I’m not sure about that now as I look at the offices on Google Earth it doesn’t look as though it manufacture in UK probably brought in from elsewhere- very disappointed. Going to give them a little more time - I will look for aternatives though

As an addendum to the previous review I’ve kept trying to phone amazingly the reception call was different to the previous times however you put me through to a voice which told me to have a great day and they will get back to us as soon as they co

Update - 3 weeks on - In the end I gave up on trying to call them - I submitted what they call a ticket which did after a few days wait get a response. I did as requested but with no success. I fed back what happened and also reported new my observations re connecting what they call ilink. They asked for my - login details to the monitoring App which I refused for security reasons. It would appear that the instruction sheet that came with the equipment did not say how to set up the Myimmersun application - If it did I could not find it - by the way the application is web based not in App Store. - which was a surprise after reading their advertising information. The responses I received from them at times made me feel they were telling me off and they did surprisingly threaten removing the so called help facility which after spending so much money on the equipment this was the last thing expected . So it has not been a great experience getting to where I am now. I hope to get through the warranty period without having the need to contact them again should a repair or replacement be needed I think I would not bother. I did notice that on all the responses I did get addressed me by name but there was no agent names.

The myimmersun app should be in the App Store according to agents response. Hopefully when it does it brings something more that the Webb based app,

I am sorry to give such a low mark and I am sure others experience will be so much better than mine - well at least I hope so.

Efficient and speedy reply via email! Product was delivered 2 days after order was placed. Customer is happy with product and set up!

I had an old Immersun which gave up the ghost after 13 years of faultless service. I ordered a replacement and it arrived the following day.
With some great email support to get the existing wireless sender reconnected (well it has been 13 years since I did it last!) I am back up and running with a hot tank of water again.
Thanks Immersun.

I had a question regarding settings on my Immersun and Anish was quick to contact me and fully answered my question.
I found Immersun Support very helpful

Horrible service, really bad experience, end up with no money and no charger, it is a joke company, do not trust them at all.

Anish M MEng provided a clear and and comprehensive step by step procedure which I was able to follow in order to identify the root cause of the problem. Many thanks.

My Immersun solar diverter has failed after 13 months, and there is no flexibility or goodwill for either a free or discounted repair, just a standard high price to investigate the fault with no promise of a repair.
It's the second such unit I've had fail just outside of the warranty period. It's very disappointing, and I won't buy another. It's too coincidental, it makes me wonder if they are made to a poor standard or with cheap substandard parts so they have a limited life.
It it not unreasonable of me to expect electronic items to last for several years. My TV does, my alarm clock does, my microwave does, my radio does, etc. etc. Why not Immersun units? Why do they have short lives and fail just past the warranty period?