2xD5 vs 2xDDC long loop comparison (serial scaling)

[NaeKuh]

Yes, but 3 of those 7 are acting as 1 block so your loop actually thinks it has 4. Had you stayed serial and with your fancy elbow setup, the DDC's would be much better. You basically streamlined your loop to the point were it doesn't matter which pump you use now.

Funny thought (and I'm not making you or asking you to do it, just putting it out there), I wonder what the DDC's would do if you put them in parallel.

WL answered it for me.

Waterlogged: but without closing one of subloops in parallel, won't most of flow go skipping resistive-lot-of-waterblocks-loop part, when one of pumps fails?

Which is why i love my DDC top.

2 inlets for paralell and then they come together @ the push in serial.