Just been playing with the Iwaki RD-30 lately.
Reflecting upon my statements in the second post about an "ideal" pump:
Quote:
6-8mH2O (20-26') of peak pressure head
12-13LPM (3.2-3.4 US GPM) peak flow rate
25-30W nominal power draw (when in operation)
12VDC
Separated Magnetic Armature design (~16-20W of heat added to the water)
Centrifugal pump
|
When run at 18v, the RD-30 is exactly the pump that I describe.
Even better - it's very quiet at 18v. Had to turn down the Laing D4 to 5v (nearly at stall point) before I would say that the two sounded as loud as each other. About as loud as an Eheim 1250, but with a non-annoying sine-wave whine, rather than the rumble that the E1250 has, or the buzzy whine of the D4's.
At 18V, the RD-30 has 28-30W nominal power draw against typical loop resistances. It's providing 4.7mH2O pressure at 6LPM is what I've measured so far (but I need to check that figure some more).
I'm just excited because at this early stage of testing it's pretty much everything I described, with the exception of having to be run at 18v rather than 12v.
If Iwaki released an RD-15 (or whatever) that ran at 12v in the same way that the RD-30 runs at 18v, then that would be exactly the pump that would be as close to a "one-size fits all" ideal, with the exception of its size (~10x11x12cm including barbs). Best of all, it's also really quiet - and that's the big thing.