Constructed this solar heater based on the following data I found on the internet.
http://rimstar.org/renewnrg/solar_pool_heater_diy_fp.htm
I figure in our climate I get more like around 1kW from each of the receptors. Additionally I was able to utilize some of the corner space pulling in more polyethylene than the original poster. (about 5-10 feet extra per coil). I designed around the Intelliflo 011018 pump which I have had purchased and installed amid this upgrade.
Total cost of project <$400 USD. Cheapest installation option I found out there was $3000. 20 hours of personal labor worth $2600.
There are easy attachment points for 2 additional receptors for a total of 10. I may add the last two as weather gets colder. I am sure I will shut down during the hottest months so I dont get my pool too warm!
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