Solar Thermal Hot Water
A solar geyser or solar hot water system absorbs the abundant and free thermal energy from the sun’s radiation and uses it to heat water.
Benefits of Solar Hot Water Systems
The use of hot water amounts to nearly half of a regular South African household’s monthly electricity bill. A solar geyser is an efficient and environmentally friendly way to save up to 80% of monthly water heating costs. They also do not require any regular maintenance, significantly reduce your carbon footprint and increase the market value of your household.
A solar geyser in one household saves approximately:
- More than 30% of electricity costs
- 2.7 tons of carbon per year
- 3 tons of coal per year
- 780 litres of water per year
Types of Solar Heaters/Geysers
A passive solar geyser uses thermosyphoning to circulate water. As water is heated it expands and so, as gravity pulls down the relatively heavier cool water molecules, the warmer molecules rise up. Therefore no pump or controller is required, lowering the cost and making it less liable to failure. However, the passive solar geyser needs to be mounted on your roof making it less aesthetically pleasing.
Solar water heating has been around for some time, it was practised and accepted around the world in countries such as China, Australia, Greece, Turkey, Israel and Japan. It has until recently been too expensive for the average South African consumer – but not anymore.
More and more South African families are switching over to solar water heating as a viable alternative to the traditional warm water cylinder. Solar water heaters are cost and energy effective, and will deliver an optimum amount of hot water throughout most of the year.
How soon can I pay back my Green Power solar water heating system through my electricity savings?
Every client is unique with different energy consumption habits and water usage. Eskom claims that your water geyser consumes about 40 to 60% of your monthly energy bill.
From our experience, if your monthly electricity bill is R600 per month and electricity tariffs continue to rise by 15% per annum, you should pay back a 150L system in less than 5 years through accumulated savings.
What happens if the weather is very bad?
Vacuum tube solar water heating is the leader in solar heating technology, operating very effectively even in cloudy and overcast conditions. Vacuum tubes use the light radiation from the sun. For e.g. if you go to the beach and it's overcast you still burn, the same principle applies with the vacuum tube. If the weather is constantly “bad” there are electric backup elements installed in your geyser for those rare “weeks of continuous rain and poor weather”.