A double skinned grp sheet panel similar to a kingspan one below, would be strengthened with beams on the outside (poss metalclad) to take presuure of water on sheet .
Water would store heat during the day, then be pumped into an insualted container (poss underground) to be pumped back for heating at night into internal radiators or back into the same panels if an insualted panel could be added to outside ( to stop heat loss to outside environment)
In a war zone, shrapnel may be slowed by water filled wall & roof panels
Initial problems envisaged are :
1. strengthening the seal between panels to take the weight of the water
2. Algae may grow i nthe panel. but a chemical may be added to inhibit growth
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