Razor6 has it exactly right - that's how the loop looks.
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it's kinda cool how all you do is add a second pump, it's a shame no one really wants to run a bunch of high wattage tecs.
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One extra pump, and two extra blocks.
It's actually more energy efficient to run multiple peltiers at say 2/3'rds peak voltage, than to run one at full voltage.
3 x peltiers @ 2/3'rds peak voltage >> 2 x same peltiers at peak voltage
They'd use less power, generate less heat, and give a greater cooling effect.