Re;flat plate reliability--was thermax [RE-wrenches]

[Tom Lane, Energy Conservation Services]

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Absolutely wrong, The small drainback 10-15 gallon reservoirs with finned copper heat exchangers that are spiraled on the inside by AET that are double pumped with a TACO 009 on the solar loop and a 003 on the water loop are the highest performing drainback systems ever tested by third parties. 
This double pump drainback system with reservoir heat exchanger approaches 95% heat efficiency compared to an open loop system.  No other system has come close to this efficiency.  The double pumped drainback system with a finned copper heat exchanger in a 10 or 15 gallon reservoir is an extremely high-performing system due to the water falling into the reservoir creating turbulent flow around the finned copper heatexchanger.
Gator Tom

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