The web info suggests the solar panel isn’t damaged by freezing but there’s the extra water from the pipes too – does it have a pressure valve?
No problem, rubber expands when it freezes. Our pipes (in both the thermal solar panels and used for distribution to and from it) are a specially formulated silicone rubber. They can expand over 100% by volume. Water expands only 4% on freezing. So freezing is easily accommodated – with plenty of strech left to go. So there is no need for a pressure relief valve in the pipes or the solar panel. Back to the top FAQ: I have a bungalow with a flat roof ground floor extension. I want a thermal solar panel for it, because I am trying to turn my low carbon home into a zero carbon home, or at least one which is carbon neutral. The upper, sloping roof could be used to support a solar panel but it does not receive the sun all of the day. The flat roof receives full sun from dawn to dusk. Installation of the pipes would also be easier from the flat roof as they could be taken up under the tiles to avoid drilling. Is it possible to have the solar unit free-standing on the flat roof? Would its own
