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Thermoserv Ltd logo, heating engineer in Surrey

Thermoserv Ltd

2.5(24)Surrey  •  NICEIC  •  MCS

Heating work

About

Thermoserv Ltd is a heating engineer based in Surrey, trading since 1977 and covering London and Surrey. They carry out boiler repair and power flushing, along with control system services, air conditioning, plant room modification and refurbishment work, and planned preventative maintenance. They take on domestic and commercial work, and offer emergency callouts too.

Services

Reviews

2.5

Thermoserv Ltd drew repeated complaints from customers who said engineers failed to arrive for booked appointments or turned up at the wrong time, sometimes without calling ahead. One customer described repeated gas checks that left no report and damage to insulation around a flue that was not put right, and said calls and emails went unanswered. Another described a boiler leak that took eight weeks and five visits to fix, with missed appointments and damp woodwork left unresolved. Other reviewers reported a boiler left leaking after a visit, a missed slot with no call, and a driver who nearly caused a collision. Positive comments included friendly, punctual and reliable service, a quick job, and one staff member named in a single review for helping a family get an earlier emergency slot.

EA
Eileen Ilenia A.Sept 2026 · Google

-Annual gas check: technician said everything's ok, leaves a written signed report. -Couple of months later: got a call about another gas check. Technician is clueless on why he was sent out, he checks everything again, asked about where about the fluke exits, rips off part of the isolation material around said fluke, then goes up to the attic to check for fluke exit. Comes back, doesn't leave a report, doesn't fix the damage. - Couple of weeks go by and again I got a text to book another gas check, this time a supervisor comes around. He says he needs to check previous technician's job, tells me about the insulation damage around fluke, carbon monoxide detector not being properly installed, check the attic, comes back, tells me someone else will be coming to fix the insulation and carbon monoxide detector, doesn't leave report. It's now September no one has come to fix the insulation, no report has been sent out. I've called multiple times now, I keep getting told that the report will be in the post in the next couple of weeks, haven't received it yet. No reply to my email. No accountability either for the damage caused. Most unprofessional company ever.

MM
Margarit M.Aug 2026 · Google

Average overall service from Thermoserv Ltd; the heating issue was resolved, but communication and response time could be improved.

RU
RuMay 2026 · Google

Philippa was absolutely amazing and extremely professional throughout the whole process. She truly went above and beyond to help my family secure an earlier slot for our emergency, and we are incredibly grateful for all her support and kindness. Her dedication, professionalism, and willingness to help make her a real asset to the company. We sincerely appreciate everything she did for us and wish her all the very best for the future.

DL
David L.Feb 2026 · Google

Anything above 1 star would be a criminal offence. Where do I start?!? I woke up Oct 1st 2025, to find a large puddle of water that had leaked from my boiler overnight onto my kitchen worktop. I reported it to my council who have a contract with this company. I was told someone would come within 24 hours and much to my surprise someone showed up within a few hours (only reason for 1 star). He claimed there was a blockage someone and he removed the debris, he was in and out in 15-20 mins. Within 2 hours of him leaving the boiler started to leak again. I called the council the next morning and they said someone will be out to inspect. Another person came and he said and did the exact same thing as the previous engineer; he stayed for 10 mins! Shortly after he left the boiler started to leak AGAIN, so I had to report the leak AGAIN. A days/weeks later the original engineer shows up and says he knows what the issue is, he changes a part and says I promise you it is fixed, “I will even come back tomorrow after work and knock on your door to check”. Did he show up the next day?…no! Did the boiler leak again?…Yes! So I report it for a 4th time, I’m told I have to wait a some time (several days) for an engineer to attend. Due to the leakage and not being able to catch the water properly the wood boxing around the pipe work has become damp and expanded. The engineer eventually comes says he knees exactly what the issue is but he needs to order a part and was in and out of the property in 5 mins. The job then gets rebooked and the boiler was eventually fixed and he said he would log in his report that the wood boxing would need to be replaced, somebody would contact us. So, it took 8 weeks to fix a leak and 5 visits from 4 engineers to fix. Nobody contacted me about the boxing so I had to contact the council again, because of the busy Christmas period I was told the first available date was the first full week in Jan. I booked a morning appointment and nobody showed up. I call the council and they say Thermoserv have said the engineer had an emergency but someone else will be attending. The engineer shows up an hour before I had to leave to go on the school run. He said he doesn’t have the right wood or access panel to install that day but he promises he would be back to do the work. He calls his office and puts it on loudspeaker and they booked a job for the following week. The following week comes and again the timeslot is missed. We call again, the info we received is that the engineer was stuck on another job and he is on his way. Our bell rings and it is a totally different guy from the week before. He said he only started with the company the day before and he was given the job half an hour ago. He doesn’t have the tools, the wood or any info on the job to do it today. He said he could tell how frustrated I was with everything, so he personally promised to come back when someone would be at home to do the work. We booked in for the following Tuesday and guest what?…nobody showed up! I called the council yet again, thermoserv contact me directly and say they are so sorry. The engineer was unprofessional for contacting you and that they have decided to relieve him of his duties as a result. I said I don’t want anyone to lose their job but if he is going to lose his then the others need to too! The woman claims that there is a shortage of wood from their suppliers and that is why there has an issue with the previous visits. I said so you can’t pick up a piece of plywood from b&q or wickes? She said it doesn’t work like that we don’t have accounts with them. She said we can book you in for 2 weeks time on Feb 6th. I said how do you the supply issue will be fixed. She said that’s why I’m booking it for 2 weeks, so it should be sorted by then. I said I need an appointment time that factors in the school runs and if there is any reason why you can’t attend or the engineer is delayed I need immediate communication. Well guess what? Today is Feb 6th, they missed the morning slot and nobody has called me. The worst!

DM
D M.Jan 2026 · Google

Very very unprofessional on the appointment that they give you and then also no quality of work that gets done 👎 Wouldn't use them ever again even for free service ❌❌❌ Wonder why they win contracts for low prices than other top company's........ Big No for me, they are waste of time ❌ ❌ 👎 ❌ 👎 ❌

Area

Surrey, CR3

Areas covered

London, Surrey

Opening times

  • MondayOpen 24 hours
  • TuesdayOpen 24 hours
  • WednesdayOpen 24 hours
  • ThursdayOpen 24 hours
  • FridayOpen 24 hours
  • SaturdayOpen 24 hours
  • SundayOpen 24 hours

Additional information

  • Incorporated 1977
  • NICEIC
  • MCS
  • Commercial work
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