Way back in 1984, we bought a fairly run down farm near Gympie. There was only tank water discharging by gravity into the sink. I decided that was primitive and we had a Solarhart water heater fitted on the roof, complete with a little pressure pump (took a day to install) . This was the first installation around for about 60 klm. Boy did that water get hot!!
Frequently it would boil in the roof. On one occasion it was overcast for 4 days, and even after that time, (family of 5) the water was still tepid.
I totally agree with you guys comments and would go further and say that ALL new houses without exception should be legislated to have hot water panels on their roofs - and thats all over Australia, even Tassie.
What government is man enough to implement that??
none.....
