Drainback vs. Closed Loop Circulators [RE-wrenches]

[Bill Loesch, Saint Louis Solar]

I cannot agree more with Todd that using water in a freezing climate is
_asking_ for a catastrophic failure at some point. Those KISS drainback
folks need to keep their brazing skills in good practice in anticipation of
the control failure mode.

Another rarely discussed aspect of drain back is the thermal shock of
pumping "cold" fluid into "hot" collectors. 

Bill Loesch, Solar 1- Saint Louis Solar


Message text written by INTERNET:RE-wrenches at topica.com
>
The only caveat with drain backs is the possibility (albeit very small) 
of freezing. I agree with all the advantages mentioned about drainback 
systems versus glycol... but I do not think it wise to trust a snap 
switch and/ differential controller or its temp sensor to not accidently 
pump water through the system during times of freezing weather. Brazing 
leaks on a burst absorber panel is no fun.

Todd

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