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<blockquote data-quote="roys" data-source="post: 322984" data-attributes="member: 5044"><p>Most Solar Thermal systems need a heat dump but not them all, my solar thermal system is a drain back system so if the water temperature is below 5deg C the system circulation pump ( a small solar pv powered pump) stops and the water drains back to a flask to stop frost damage. If the water temp gets above 80 deg C (I think) the pump switches off again allowing drain back to stop the system overheating.</p><p></p><p>Top tinkering by the way Onoff.</p></blockquote><p></p>
[QUOTE="roys, post: 322984, member: 5044"] Most Solar Thermal systems need a heat dump but not them all, my solar thermal system is a drain back system so if the water temperature is below 5deg C the system circulation pump ( a small solar pv powered pump) stops and the water drains back to a flask to stop frost damage. If the water temp gets above 80 deg C (I think) the pump switches off again allowing drain back to stop the system overheating. Top tinkering by the way Onoff. [/QUOTE]
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