[AngryAlpaca]

WW will give better temperatures. Are you sure on that pHaestus? I would do the calculations to see what the exact flow would be, and thus the performance, but I've got stuff to do. Impingement seems to do better with higher velocities caused by a tighter restriction.

Edit: I could be wrong, but to get approximately equal performance to the RBX at 1GPM, one would need to have a little bit more than 1.25GPM. The TDX has a pressure drop of 14.1", while the RBX has a pressure drop of 16.3" 1.25^2*14.1" equals 22" drop, for equal performance with the 16.3" drop RBX. However, as you point out, the ease of use and mounting are much improved with the TDX, making the TDX better than the RBX. I don't agree with saying that the WW is worse than the TDX due to the extra outlet, as the WW is 3 bucks less and ~1.5C better. The WW has much less pressure drop than the TDX at equal performance, that being 1GPM for the WW (20") and 1.75 for the TDX (43.2") I wouldn't think that the wye fitting was too much of a hassle.

In case you're going to bring up your system, I'd like to point out now that you got 3.05GPM through the TDX, making your pump provide 3.05GPM @ more than 10.9' H2O, making your pump abnormally powerful.