?What is different about the collector circulator for drainback-protected systems as compared with that of antifreeze-protected systems?
A. ?It only needs a single circulator as opposed to two circulators.
B. ?It must not allow air bubbles to be entrained in the return piping.
C. ?It must lift water from the static water level in the tank to the top of the collector array.
D. ?It must have potential for overcoming increased frictional head loss in the collector piping.
Answer: C
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