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 ins... See more
Immersun
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See what reviewers are saying
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 hesi... See more
I inherited an Immersun (with little info from the previous owner) when I moved into a new home 18months ago. Everything worked smoothly until a recent incident. Once I’d established contact (my web b... See more
Company replied
We had an Immersun fitted recently. It appears to work well, so I've no complaints about its basic functionality. But there's a serious caveat. If you want to make use of the Immersun app to... See more
Company replied
Company details
Written by the company
Immersun is a leading provider of energy-saving solutions for homeowners. Our mission is to help individuals and families reduce their carbon footprint and save money on their electricity bills. We are committed to providing our customers with quality products and service that are easy to use and reliable. Our flagship product, the Immersun device, is a smart energy controller that optimises the use of solar thermal energy in domestic hot water systems. By diverting surplus solar energy to heat the hot water cylinder, the Immersun device reduces the need to use electricity or gas to heat the water, resulting in significant energy savings. In addition to the Immersun device, we also offer a range of other energy-saving products, including EV chargers. Our team of experts is always available to help customers find the perfect solution for their needs. We pride ourselves on providing excellent customer service, and we are dedicated to helping our customers save energy and money. With Immersun, you can feel good about doing your part to reduce your carbon footprint and save money on your electricity bills.
Contact info
United Kingdom
- www.immersun.co.uk
Immersun power diverter broke down…
Our Immersun power diverter broke down after only 3 years of use, there were at least 10 other residents who experienced the same issue,this product is not cheap and is very unreliable.

Reply from Immersun
A company with a strong aftersales and help ethos.
If I have a problem with my Immersun, Anish is always happy to help resolve it, no matter how small the issue.

Reply from Immersun
The greatest test is when things go wrong... and how they are put right!
In my opinion, the greatest test of a company is when things go wrong - how they react and resolve problems and how long this takes.
I purchased an Immersun unit which turned out to have a fault under certain loads.
Communication was great, we worked through some tests but couldn't resolve it this way.
My return was arranged and the fault on my unit was resolved promptly (1 week after it was collected).
There has always been a fast response to my ticket. I could guarantee I would have a reply within a day or less every time.
Thank you, Immersun for the excellent after-sales service, this is my second Immersum unit in 6 years, and not only will I be back again in future, but I will be recommending you and your excellent after-sales support!

Reply from Immersun
Enjoyed setting up the new products!
Enjoyed setting up the new products, looking forward to the result. Thanks for all the help and support.

Reply from Immersun
Quick support response
I contacted support and within 4 hours had a satisfactory response which solved an issue with my Immersun problem. Great customer service and response

Reply from Immersun
Excellent support via chat on website today.
I have had issues with Immersun in the past (faulty equipment and bad customer support) but today I used online support via 'chat' because our Immersun stopped working after a power cut and the help I received was excellent.

Reply from Immersun
Top drawer and super responsive support…
Top drawer and responsive online chat and email help. Very clear instructions provided and Diverter issues resolved.
An additional query submitted online was answered by a telephone call back. How's that for excellent customer service and where else do you get that nowadays. Superb company thank you Anish. Customer for life.

Reply from Immersun
Have an old unit that was fitted before…
Have an old unit that was fitted before the original company went bust. Several times when i needed support the new owners claimed that they are only supporting the older units out of goodwill and they have no responsibility or obligation to the original owners. Twice they even tried to claim that they are unreliable, catch fire and (surprise, surprise) i should purchase one of their new ones. When i mentioned trading standards and if they now own the intellectual property, i was quickly cut off the app and all communication stopped. Pathetic, will be swappping it for the much better myenergy Eddi very soon.

Reply from Immersun
Great App
Immersun have always given great support but I have just downloaded their new APP... Outstanding

Reply from Immersun
Clear well written advice
I had an issue with my Immersun units connectivity to the internet
Having raised the problem I received a comprehensive replay from the support team suggesting potential cures. I worked through the suggestion and very quickly solved the problem.
Excellent support, thank you!
Great and speedy service from Anish and…
Great and speedy service from Anish and the team.
The Immersun was collected, repaired and returned quickly. Excellent customer service, thank you Anish and the team.
Just got to clear installation with my electrician ....
At this stage I am still considering whether to order a replacement for my old Eco Immersun. So far the help and advice from (new!) Immersun I've had has been given very quickly. I merely, now, need to speak to my electrician concerning installation. If he's happy, I'll certainly be going ahead. Thanks Fellahs!
Five star support from Anish.
Five star support from Anish.
Fast, courteous , simple, worked.
Great support
Even though I bought this immersun unit way before the present company took control they have provided an excellent after sales support each time I have needed them.
Well done Anish and the team.
Bad Product and Customer help
I am a contractor; they sold the product we installed it and they are trying to find everything they can to get out of replacing it.
The customer has no hot water, and they are the ones feeling it.
Why are their products out there if they have a design fault.

Reply from Immersun
Well worth it
Bought the original version (made by eco4 who sold company brand and product to current manufacturers)...in 2014. Still going strong and infact have now re-established the immerlink functionality courtesy of the very helpful help desk. Works a treat
anish answered my query very quickly…
anish answered my query very quickly and explained what to do
Anish was extremely helpful
Anish was extremely helpful, explaining the Immersun and answering all my questions. He even sent a useful email confirming the points afterwards.
Warning: wireless connectivity will cost you an extra £199
We had an Immersun fitted recently. It appears to work well, so I've no complaints about its basic functionality.
But there's a serious caveat. If you want to make use of the Immersun app to control the main unit remotely, that will cost you an extra £199.
No,that's not a typo - £199 to connect your Immersun wirelessly.
Seriously? In 2022?
£199 for a glorified WiFi repeater - which connects to the Immersun wirelessly!!
What a rip-off.

Reply from Immersun
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