Solar water heating systems (solar thermal) use heat from the sun to work alongside your conventional water heater. The technology is simple and relatively cheap, making solar hot water generally the most cost-effective renewable measure to fit to your home. They are very efficient and work well even in Staffordshire. Solar panels are fitted to your roof, facing south west to south east. These collect heat from the sun's radiation. A heat transfer system uses the collected heat to heat water, which is then stored in a hot water cylinder.
What are the costs and savings?
Solar thermal can provide almost all of your hot water during the summer months and at least a third of your total hot water needs. The average system reduces C02 by around 350kg per year and cuts about £50-80 a year from your hot water bills, depending on the fuel replaced.
The typical installation cost for a domestic system is £4000 - £5000. The Energy Saving Trust has more information about solar water heating.
Important points
- Solar water heaters work best if your existing central heating system already includes hot water stored in a cylinder (as opposed to instantaneous hot water provided by a combi boiler)
- Preferably you will need between 2 and 5 square metres of south-east to south-west facing roof space that receives minimal shading during the day (about 1 square metre per person).
- You may also need space for an additional water cylinder, although some systems use the existing cylinder.
- There are a range of systems and technologies. Consult two or three companies for advice on your particular circumstances and a quotation.
- Look for installers who are members of the Solar Trade Association.
- Beware of some national companies who use hard-sell techniques and make exaggerated claims. Their products may be good, but their prices may be high and customer services low.
- Solar water heating systems generally come with a 5-10 year warranty and tend to require little maintenance
Renewable Heat Premium and Incentive schemes
A new solar hot-water system qualifies for a £300 flat payment, called the Renewable Heat Premium, towards the installation cost. This scheme runs from 1 August 2011 until 31 March 2012. Click here to find out more, or visit the DECC website for updates about the scheme. Note that the product and the installer must be accredited under the Microgeneration Certification Scheme to qualify for this grant.
It is likely that solar hot-water systems will be eligible for incentive payments under the Renewable Heat Incentive scheme, which is planned to start in October 2012. But, only systems installed after 15 July 2009 will be eligible for the incentive payments.