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Not quite what I meant. Think of a solar hot water heater (standard item) that sends the heated water through the house in pipes to wall panels. Using heated water is old technology - think of the boilers that lots of buildings overseas have in their basements. Using the sun to heat that...

Apparently Sydney is having it's coldest day since the early 80s, so my thoughts are turning to heating, too. I was thinkiing hydronic with solar power to haet the water? Would cost a bit to set up, but the running costs would be minimal. Of course, winter will be gone before I do anything...