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Boiler feed and returns

KBP&H_3
KBP&H_3 Member Posts: 67
Why do most gas boilers and some oil have the feed and return on the same side so that the water can travel up the first section and exit. Why wouldn"t we want to flow the water from the bottom of one side to the opposite top of the other, creating flow across all sections>  when small zones it's hard to believe the furtherst section is getting much water. Any ideas? 
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