How to safely install a solar powered hot water system
Living under the cloudy skies of Britain you could be forgiven for assuming that heating the water in your home by solar power is little more than wishful thinking. But, as more and more householders who have solar panels installed on their roofs are finding out, even when the sun's not shining heating your water by solar power still works…and saves money!
Solar power technology for domestic properties
To heat your hot water using solar energy, three components are needed:
Solar panels -- These are set on the roof of the property to collect solar heat. For optimum performance it is preferable that the roof slopes to a southerly aspect where sunlight exposure is maximised. Before installation you may need to apply for planning consent. However, you should check with the planning office as changes to permitted development rights for microgeneration technology in April 2008 have helped lift many of the planning restrictions applied to roof-mounted solar panels.
Two types of solar panel are available: flat panels, which collect solar heat through a large absorber plate; and evacuated tube arrays, which collect heat via individual absorber plates within the tubes.
Heat exchanger -- A method of transferring heat energy from the solar panels to the domestic hot water system is required. This is often achieved via a manifold system through which the domestic water supply is run. The energy from the panels heats the fluid as it passes through the manifold.
Hot water tank -- For storage of the solar heated water. This may be a cylinder that is additional to your existing hot water tank.
Purchase and Installation
Flat panel solar technology costs around £3,000 to £5,000 to purchase and install. Evacuated tube systems are more advanced, more efficient and (naturally) more expensive!
It is highly recommended that a certified professional installer experienced in solar powered hot water systems is employed for the installation. They can also help you assess your requirements and recommend suitable products for your situation and budget.
Solar powered hot water systems normally come with a 5-10 year warranty. They require very little in the way of maintenance - just an annual check to make sure that the panels are free from debris, and that the water is being heated sufficiently. A more thorough examination of the system by a qualified installer is recommended every 3-5 years.
Benefits of solar power
In the UK a solar powered system will typically supply between a third and a half of all your hot water requirements. The fuel 'displaced' can be considerable. In a gas-heated property, savings of up to £70-£80 a year can be expected. For properties whose hot water supply is electrically heated you can factor in a saving of £100-£120 a year! Given that energy prices are rising fast, is it time you considered the solar option?
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