Support for your Solar Thermal System

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Cold weather
Could the collectors of a Grant Solar Thermal system freeze up in cold weather?
How often do I need to replace the fluid in my solar installation?
Do solar thermal systems require a lot of maintenance?
How often should a solar thermal system be serviced?
Will the solar panels still work on a cloudy day?
How can I improve my solar thermal hot water system?
What stops the fluid in the solar collectors from freezing?
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