This is from a test run that I did with 100 litres of water in a black plastic container over about 6 1/2 hours:

Time | Water Temp | Outlet Temp | Box Temp | Ambient |

11:00:00 | 20 | 21.7 | 37 | 20 |

12:10:00 | 27 | 28.4 | 30 | 20 |

13:36:00 | 33 | 34.4 | 43.5 | 22 |

15:00:00 | 36 | 37.2 | 47 | 23 |

17:17:00 | 37.8 | 37.8 | 30.5 | 23 |

18:20:00 | 35.5 | 35.3 | 29 | 22 |

This shows the unit can pick up a fair amount of heat - 17.8 degrees C in around 6 hours. Since 1 Litre of water is equal to 1 Kg of water and it takes 1 Kcal to heat 1 Kg of water 1 degree, this means the system put 1780 Kcal of heat into the water which equals 7,447,520 joules or 2.0687 kilowatt hours.

This shows the result graphically:

What is interesting here is that as soon as the sun goes off of the tubes and box cools down, the system actually starts to radiate heat and

__the water!__

**cool**As to whether this would help with the pool situation, the numbers aren't very encouraging! If it can heat 100 litres of water by 17.8°, this means it would heat 1,000 litres by 1.78° and 10,000 litres by only 0.178°! Unfortunately, the pool probably holds 40,000 litres, so even two solar units might only provide 0.112°! Well, I will continue with unit #2 and then see where it goes. I can also work on the positioning and angles for the units as well. Currently they are just pointed roughly South, but it may be worth checking different positions.

By the way, when I checked how much the 100 litres of water in the container was heated

By the way, when I checked how much the 100 litres of water in the container was heated

__the solar heater it was only one or two degrees, so the unit certainly does something!__**without**
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