Question:
Cheap pool solar heating is very easy to make btw,
probably easier than installing electric into the water.
Details?
10m^2 collector area, how does it work?
Polythene over hosepipe?
Answer:
ok... firstly I would not use an open roof surface for collection, as
a) it will also collect birdshit and other assorted bacteria
b) it will leak water onto the roof structure underneath the covering
and rot it.
Buy a ¡ê50 pump, checking it can run continuously and has a type of
motor that can be slowed down eaily.
Spend the rest of the money on hosepipe, the more the better. Avoid
orange, white or light grey. Wind it in a huge flat spiral pancake.
You'll get a lot more heat if you space each turn out by one pipe
width, but that requires wire or similar to hold it togther/apart. Aim
for 10 square metres or more.
Cover the pipe with polythene, add the pump on an RCD, and run it at
lowest speed setting.
You now have a fairly efficient low cost 10kW heater.
