Product review (5 stars): test results
Replace the red orifice (http://www.amazon.com/gp/product/B002UR6MOY/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1) with this one as it has a smaller hole.
Measured the flow in and out of the humidifier with each orifice and results are as follows:

note: Each test was done about a week a part and possibly different water temp, and pressure.
note2: Each individual number was an average from 3 test.

Test 1:
834 ml/min no orifice
358 ml/min in, red orifice, hot water
300 ml/min out, red orifice, hot water

Test 2:
323 ml/min out, red orifice, cold water (did test days later with possibly different inlet pressure so just for reference)
195 ml/min in, yellow orifice, cold water
153 ml/min out, yellow orifice, cold water
145 ml/min out, yellow orifice, hot water

Evaporating only 1/4 of the water I deemed as acceptable for the continuous flush that is needed.  I also deemed that the hot water expense was not necessary although it did seem to evaporate more.