Solar thermal repairs & maintenance

We repair, maintain and service solar hot water systems.

Which Trusted Trader

Local engineers

Keeping your hot water flowing

Solar is a fantastic eco-friendly way of heating your hot water. Rayotec ensures your solar hot water system keeps your hot water flowing efficiently with a range of repair and maintenance services.

Do you need help with the following:

For PV/solar electric repair click here

Why choose Rayotec?

  • Free Assessment and Fault Finding Which Solar
    Free telephone or email assessment and fault finding. 
  • Which Trusted Trader
    We are proud to be Which Trusted Traders and follow their code of practice for your peace of mind.
  • Accreditation
    We are accredited by MCS and are also NICEIC "Approved Contractors".
  • Experienced
    We are a family business and have installed and serviced thousands of systems over the last 30 years
  • Great Value
    We have local engineers dotted around the South East and group call outs together to lower costs.
  • For dometic systems we cover Surrey, Sussex, Hampshire, Middlesex, Berkshire, Kent and Greater London
  • For commercial system we cover the South East, Greater London, Midlands & Bath & Bristol area.

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Our Services:

Fault Finding & Repair Service

Sometimes, regardless of the care you take, things can go wrong with your solar thermal system. In these situations you can get in touch with us knowing that, with our local offices in the South East and our wealth of experience and knowledge of solar thermal hot water systems we will be able to get to you quickly to locate the problem and resolve it so that your system is back up and running as swiftly as possible.

Common problems we deal with:

  • Faulty pumps
  • Control unit and sensors failing 
  • Air locks / blockages with the pipework 
  • Leaking components ( pipework, expansion vessels) 
  • Leaking hot water cylinders
  • Storm damage
  • Loss of pressure
  • Panels being removed and reinstalled due to reroofing

We unfortunately cannot help with Thermodynamic systems


Rayotec is a  family run business. With over 30 years of experience working in Solar Energy under our belts you can rest assured that we have the knowledge and expertise to check your system thoroughly and efficiently. 

As Which? Trusted traders we ensure that the work we do is of the highest quality and that our customers get the exceptional service that we are known for. We have installed thousands of system throughout the South of England and as a well established business we are able to group our calls geographically in order to keep your costs low, and with every call including up to 1 full hour of labour we are able to offer the highest level of service at the best possible price. 

Added to that, as we are based in the South East of England, we are in the perfect place to offer expert, local advice and servicing to the Greater London Area and the Home Counties.

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Solar hot water panels

Health Check & Antifreeze Change

All solar hot water systems use antifreeze as it's heat exchange liquid to protect it from freezing in the colder months. This liquid degrades over time and should be changed every few years so we recommend a Full Health Check every four  years to review the system and check the quality of the liquid to ensure it is working as it should to protect your panels from low temperatures in the winter. During our 4 yearly assessment we will:

  • Inspect the solar array for any damage or material failure (if access is available otherwise from ground level visual assessment)
  • Inspect any visual pipework and insulation
  • Check the performance of all system valves and controls
  • Check the circulation of the system
  • Test the quality of the anti-freeze liquid
  • Drain down and dispose of old fluid where necessary
  • Supply new anti-freeze and recommission where necessary

Taking care of your Solar Thermal System

It is important that you give your solar thermal system an occasional inspection yourself to check for any obvious issues, and arrange regular check ups to  ensure that your system continues to work at its maximum efficiency and getting you the most out of your investment.

Keep Them Clean. The variability of The Great British Weather is such that dirt and dust are not likely to build up on your solar panels, making them pretty much self-cleaning, but it is worth keeping an eye just to make sure that there is no build up of grime that can reduce the effectiveness of the panels. 

Look out for Over Hanging Trees. Keep an eye out for any infringing greenery that has sprouted up and may be overshadowing your roof and blocking the precious sunlight from your panels. (Make sure that you check with the necessary authority before you start lopping down trees!).

Cast an occasional eye over the system. Every now and again do a quick visual check to make sure there are no obvious faults. That there are no leaks around the joints (antifreeze has a distinctive pungent smell), that the pressure is as it should be, the fan comes on when it is supposed to, there are no obvious cracks or damage etc.

Get Regular Health Checks. Just like your car, your Solar Hot Water System needs a regular check-up to make sure that the system is operating as it should. Our experienced and efficient team of engineers are familiar not only with the systems that we have installed ourselves but also a whole range of different Solar Thermal Systems. They will use their knowledge and expertise ensure your solar energy system continues to provide you with plenty hot water, and ensure you enjoy all the long term benefits of a properly functioning solar energy system for many years to come.

Solar thermal panels


Checkatrade Customer in West Byfleet

08 Apr 2019

Service and Repressurise Solar Thermal System. “I cannot fault the standard of service from this company. In my first telephone enquiry, all of the options were clearly explained and once I had made my decision I was contacted the following day to arrange an engineer visit. The engineer arrived on the day and at the time promised, and carried out the required work efficiently and professionally. He then explained the work he had carried out. I cannot recommend this company highly enough.”

Checkatrade Customer in Lutterworth

08 May 2018

Repairs to solar equipment. “Good, efficient service.”

Checkatrade Customer in Weybridge

17 Jan 2018

Overhaul and maintenance of solar water heating system. “Very professional and customer friendly.”

Checkatrade Customer in Leatherhead

16 Jan 2018

Service heating panels. Change fluid. “On time, efficient, no mess, very pleasant.”

Customer in Farnborough

29 Nov 2017

Kept fully informed on engineers eta. Job completed as described. Engineer very polite and helpful.

D Bowles, Estates Manager

20 Sep 2017

Rayotec have been working with us for several years, helping us to continue our aim on reducing our carbon footprint by using Rayotec solar thermal system to heat our hot water requirements. This coupled with Rayotecs after sales service, providing peace of mind for our ongoing maintenance requirements.

Repeat Customer, Harrow

09 Aug 2017

I had a solar water heater panel serviced. I have dealt with this company on more than one occasion and all jobs have gone well. I have already recommended them to others

Customer in Rickmansworth

31 Mar 2017

Very good, friendly man and as far as I can tell the work was done efficiently and well.

Customer in Maidenhead

07 Nov 2016

Very helpful, very prompt and efficient

Customer in Crowthorne

07 Nov 2016

Their time keeping was very good, they rang before they came and were very tidy. I am very pleased with the work

Customer in Littlehampton

01 Nov 2016

The work was carried out satisfactorily but a leak developed in the pump and this was mended at a later date

Customer in Haslemere

24 Oct 2016

I was very impressed. They were efficient and professional I could not fault them


04 Oct 2016

Rayotec Ltd replaced a faulty pump on this customers solar thermal system. "They are brilliant! 10 out of 10"

Customer in Harrow

30 Aug 2016

Dealt with this company on more than once occasion and all jobs have gone well. I have already recommended to others