What does installation involve?

The panels are specially designed to look like a roof window – usually a black sheet of metal in a double glazed box. This means they are not an aesthetic problem and can usually be installed in conservation areas because of this. As a rule, planning permission is not needed, although it may be best to check in your area.

A panel can be fitted in a flat roof, but a frame will be built to position the panel at a 20-50 degree angle. The installation of older water heating solar systems used to mean ripping out existing plumbing to replace it with a new system which included anti-freeze, to prevent the system from freezing. This problem has been solved by advances in technology and the installation can now be very simple if a new system is used, and does not involve replacing the existing plumbing system.

The fitting itself is not complex – Do It Yourself kits are available from some companies. For those with the know-how, Solar Twin sells the DIY kits for £2,500, and claim it is "as easy to plumb in as a washing machine".

Is maintenance difficult or expensive?

Solar energy service companies should offer a warranty with their products, usually for five years. This will cover any problems during this time. Stuart Lovett, a technical surveyor from Solar Twin, explains that new developments in technology mean that the upkeep of water heating solar panels is easy. "If there is a problem," says Stuart, "it is usually the boiler. As with any mechanical products, a boiler does not last forever and may need replacing." This can be done quickly and easily by a professional.

Don't forget…

• To apply for your government grant.
• To consider which type of solar system is best for you - bearing in mind disruption caused during installation.
• To phone around different companies for the best quote.
• To ensure the system is weather-proof and covered by a warranty.
• To contact the Solar Trade Association with any questions, or for general advice on solar energy equipment.