| And add to this mix the fact that Tsurumi's US distributorship is now Aquascape only.
Steve Bekkins, I figure you know this. Tsurumi's POMU2 does about 47 GPM at 5 feet drawing 352 watts, but retails at only $212.00. Asking for 33% more flow using 33% less amperage, even when paying twice as much may be unavailable and has been unavailable in the places I'm able to look.
I believe this is an illustration of what you meant by less efficient, as long as there is a centrifigal able to checkmark these three boxes. Not hard. W. Lim's Wave 1 with 1/8 HP pumps 60 GPM at 8 FT (better), uses only 132 watts (better) and costs just over $400, 409 at AES. First pump I checked, so there must be more.
So, buck for buck, centrifigal pumps are more efficient at moving water by using electricity.
Wouldn't it be nice to have an 1/8 HP and 1/4 HP propeller pump available also though? 80 GPM at 6 FT using 132 watts for $400? I'll buy it.
Mickey the windowman |