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I had not heard of these. The mechanism seems to be to circulate a cooling fluid, such that more heat is generated than used by the circulating pump. A relatively new addition to the solar panels market, solar dynamic panels produce hot water in all weather conditions. Attached to the roof of the home, the panels do not require a backup system of gas or oil and a single solar dynamic panel can provide 55˚C hot water sufficient for a family of five every day throughout the year. Has anyone used them, and are they still a thing? They seem to cost about as much as a big boiler. http://thegreenhome.co.uk/heating-renewables/solar-panels/solar-dynamic-panels-overview/ https://www.thegreenage.co.uk/buy-thermodynamic-panels/ Can @Onoff make one out of beer cans and an old fridge?