Drainback vs. Closed Loop Circulators [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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I hope Jeff Lane steps in on this one.

I have seen bad experiences with evacuated tube collectors. They are 
fragile and the performance gain is not worth it unless you are trying 
to make steam. Flat plate collectors are heavy and take 2 to 3 people to 
lift them on the roof, but they last forever.

Drainbacks are more efficient in terms of heat transfer, but the energy 
for pumping is MUCH higher than a closed glycol loop. It is probably a 
toss up as to which is better. What do others think about this?

Todd


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