awesome review! looks like single loops wins. now if you were to add one more twist, which one would win in this scenario: a single combined loop with only one pump, or a two separate loops with a pump in each loop? basically, the only thing that's changed is that the combined loop with one less pump. taking one pump away would mean less pressure/flow, but that also means that the heat from that pump is not dumped into the loop. so now, any ideas which one would win?