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Ok well I can choke off the main output port a bit and thereby increase the flow through the pipes and see if the resulting flow temperature rise product is greater so thanks for the suggestion will give it a go.......................JR PS Still getting a 9 F rise in temperature input to output...

Ok I will try and take a picture tomorrow, it is dark here now, and then I will have to find out how to post it on this site. The solar heated pipes are 4 inch but there are a few yards of undergound but insulated 2 inch pipe feeding them. The 4 inch pipes are layed out in my field at a level...

Thanks Mark allowing for the fact that your pick up area is significantly greater than mine my efforts don't look so bad. I don't know what time of day you took your readings but I took some today towards the end of the 8 hour period and I was getting a 5.4 degree rise at 14.04 gallons a minute...

Thanks for coming back on this folks and Hi again Chem Geek you are a long way from the Complete France forum just now, I don't think Pool Guy visits this site! My problem is that all I have is my experimental results obtained simply by measuring the flow rate with a bucket of known capacity...

It would be very helpful to me if some of you good folk who use solar heating for the pool could post your heater panels performance figures. i.e. flow rate and temperature rise in full sun and little or no wind. I need the information to see just how effective, or otherwise, my humble efforts...