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Frequently Asked Questions on Solar Hot Water Systems
Q: What do I need to consider if I want a solar hot water system?
- you have northerly facing roof space for the panels
- the roof space for the panels is unshaded by trees etc
- the panels are inclined approximately 25° from horizontal
- the tank is properly sized for your longer term needs
- the booster is connected to off peak tariff, and
- your major use of hot water is in early to mid-morning
Q: Does my roof have to face North?
If your roof space is not northerly but within 45° of north you will only suffer a few percentage loss of solar gain. If you have a flat roof then mounting frames can be provided to obtain the correct panel inclination.
Q: What if I live in a frost prone area?
If you live in an area prone to frost or clear cold nights, its possible that water can freeze and damage the panels. Manufacturers do make Anti-Frost panels which are used and are designed to keep a small amount of fluid and warm water circulating to stop the water freezing on cold nights.
Q: Can water be heated on a cloudy day?
Yes. Although the heat output of the solar collector is reduced on overcast days it will still be able to provide heating. If it is a heavily clouded day or raining, then more gas or electric boosting may be required to maintain water at the required temperature.
Q: Is solar water heating a viable alternative to gas or electricity?
Solar should not be seen as a alternative to gas or electricity, but rather a supplement. Solar cannot totally replace the need for gas or electric heating as there are sometimes days when there is little sunlight. When averaged over a year, a correctly sized solar system can provide 60%-70% of a household's hot water needs.