?What is the recommended water flow direction when adding heat to an unpressurized thermal storage tank?
A. ?Hot water enters at the bottom of the tank and flows upward.
B. ?Hot water enters at the top of the tank and flows downward.
C. ?Hot water enters at the center of the tank and flows upward.
D. ?Hot water enters at the center of the tank and flows downward.
Answer: B
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