Geordie, either you had a “junkers”, or in the new buildings they put huge racks of collectors on the roof piped in common, and pumped down to the tanks. From the individual tank’s thermal point of view, there are billion of Btus, or zillions of kilo-calories(depending on where you are from) available, and that size of collector bank will collect energy even in the winter. There are engineering and financial nightmares when these things go wrong, but its the up and coming thing with architects.
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