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Solar Thermal - The roof doesn't face south. What can be done?

Whilst a south-facing roof is an ideal location, it's not absolutely essential to have one. Anywhere between south east and south west is also acceptable. An east-facing roof collects solar energy mainly in the morning, whilst a west-facing roof collects solar energy in the afternoon. With solar thermal installed on east and west roofs you can either accept slightly lower efficiencies, or increase the collector area to compensate.