AI Review Summary
Based on 106 reviews
Customers report excellent support, fast delivery, and reliable performance from Immersun products, particularly EV chargers and power diverters. Many reviews highlight responsive technical assistance and successful long-term usage. Some issues with wiring instructions, app connectivity, and rare defective units are noted, often resolved promptly by support. A few reports of premature failures and warranty disputes appear, but overall sentiment remains strongly positive.
What customers love
- Fast delivery
- Responsive support
- Easy installation
- Great value
- Reliable performance
Common concerns
- Expensive pricing
- Faulty units
- Poor instructions
- Connectivity issues
- Warranty disputes
Last updated 1 week ago
I
Ian Sunbury
I ve had two Immersun 2 in 12 months The first indicated a fault after 6 weeks Customer support insisted that I had a faulty immersion heater I had to employ a plumber to drain and change the immersion at a cost of over 200 The Immersun still said there was a fault money wasted The installer electrian came to check the Immersun but again Immersun customer service still refused to accept the unit was faulty Numerous checks carried out then their customer service agreed it may be faulty after all But they wanted the old unit back before they would send out a new unit I was using their own approved installer so after protests that this would delay repairs they finally agreed to supply a new unit Received installed and worked Now a year later ar 5 40 am we were woken by our fire alarm Rushed onto landing full of smoke White smoke coming from Immersun unit which was on boost Power off and cover removed to find a connection had melted and the unit was very hot Don t know the cause may be a fan failure Raised a ticket with Immersun their support procedure requesting help and guidance as the unit was still under extended guarantee Acknowledged but no promised telephone call I employ an electrician to bypass the defunct unit so I can operate the immersion manually Another bill because of Immersun Still waiting for help from Immersun but the installer has agreed to supply another unit from another company at trade and fit for free That means over the last year a Immersun has cost me about 750 and I m still faced with another bill for another unit Take me about 10 years to recover that cost It s a good product when it is working but is unreliable The customer service and after sales support is dreadful I ve lost all faith in Immersun and am now worried that these units are a fire risk Luckily our smoke alarm was only a few feet away from the unit but if it had been elsewhere the whole place could have gone up Just checked my ticket status and find that Immersun has closed it No telephone call no e mail no explanation nothing So Immersun are refusing to deal with the failed unit under warranty Says it all about this company I have since received an apology from the new team at Immersun The unit has been updated improved and relaunched The terminal that overheated has been redesigned I have been assured that the new team is fully committed to providing an outstanding product and customer experience This is a British made product that has enormous potential both in the UK and for the export market I have had a solar diverter for about six years and it really is a great idea Why export surplus power when you can use it yourself
D
David Turkhud
Unit blew up
Waited over a week for replacement unit On arrival found to be missing antenna and fuse units so still not having the ability to use the solar power system I have also been informed that although my original warranty finishes at the end of September this year and Immersun have had to replace the unit as it blew up I am not entitled to a new 1 year warranty for the new unit
R
Robert Gathergood
It will take longer than you think for payback
On the face of it free hot water is a bonus no matter how much or little The description of the system suggests that you might get all or most water heating through the diverted Here s the thing Showers and baths tend to happen in the evening or early morning but the sun is NOT shining especially in Winter So there s a real tricky balance to strike between the setting of the thermostat for this system and the thermostat used by your heating gas So far in 3 months I have saved 8 with a best day of 0 32p It will get much better in the spring and summer but don t expect free hot water It s going to take about 5 years to pay back and I expect a failure of some component before this time fan I m pleased I installed this as it does feel that I m getting something for nothing but I would have felt better if I d only paid 200 or so One other slight issue is that once this system is installed it s tricky to revert back The server was not always available so couldn t use the boost function I would say it s ok
B
BGW
Eventually fixed
Having worked well for a few months a power outage has stopped the unit working at all I asked for help 2 weeks ago and got one of their fabled tickets Nothing has happened I think 2 weeks of lost use is sufficient to be unhappy The after sales service is non existent So I pay Immersun 500 it works for 6 months goes wrong and they ignore you There is no way to contact anyone PLEASE DO SOMETHING IMMERSUN UPDATE This was a one star and now upgraded to a 3 star because a couple of days after this Trustpilot post I was contacted and they provided the fix to get the system working again so thank you Immersun But you really need to speed up customer service and make people feel they are being listened to and not ignored