A plate heat exchanger operates at its highest thermal efficiency when the volumetric flow rates (and heat capacities) on both the hot and cold sides of the plate are equal, i.e., a ratio of 1:1. Balanced flow creates symmetrical fluid velocities, uniform shear, optimal turbulence, and maximum Number of Transfer Units (NTU).

In commercial HTST dairy pasteurizers, regeneration accomplishes 85% to 95% of total heat exchange and thus has the largest number of plates and surface area. The heating section uses hot water/steam to supply the remaining temperature rise ($65^\circ\text{C} \to 72^\circ\text{C}$), requiring a moderate area. The cooling/chilling section uses chilled water or brine and requires the smallest surface area. Hence: Regeneration > Heating > Cooling.

The most modern advance in sanitary dairy plate heat exchangers is the glueless Clip-On / Snap-on gasketed plate heat exchanger. It eliminates adhesive glues (which degrade under CIP chemicals and require hazardous chemical solvents for replacement), enabling quick, tool-free gasket replacement during dairy maintenance.