lets see, i have 4 velocity pumps.

they are the only pump i will buy for under 1200gph. they literally are that quiet. it is amazing. the only other pump that came close was the original Quiet Ones. the all metal jobbies. they were also great, the later ones had problems overheating and cracking when used in SW, to viscous.
the T4 do run hotter than the others. they may also need to be cleaned more often. this is just a quick soak in a vinegar solution. the Ca buildup will just fall off with little effort. Ca likes to form on hot surfaces.
G~