I've got a pair of Iwakis just lying around, that I sort of want to use. Now, these things add alot of heat to the loop at full 24V, so running it at a lower voltage is probably wiser. I'm not making huge ass loops, at most 4 blocks and two Monsta's (240/360) or perhaps triple PA120.3's. I do have the trusty, old, Meanwell S-150-24, but then I'm stuck with the full 24V - unless I can somehow reduce the voltage. I know I've read that people run these at 18V, but not how The 2nd option is to grab an S-150-15, which should be adequate, I guess. Any thoughts?

PS: where does one buy these pumps these days? Someone in a local forum was wondering where he could get one.