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Old 09-27-12, 08:38 PM   #4
Mikesolar
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Not much new in the pumping field that is better than a standard Grundfos pump unless you want to go DC. A variable speed control like the RESOL can give about 8% better output over a single speed system and can be used with any of the can type pumps.

All the systems that are not drainback will need propylene glycol as an antifreeze. Type of panel doesn't matter.
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