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Originally Posted by Cathar
Yes, that's what I was suggesting. Doing that would perhaps be the best option if you wanted to ask Iwaki to do a "special" order-run for you.
The RD-20 runs at 3200RPM though. If they're going to do a custom run of RD-20's, I would probably ask if the RPM's can be reduced to be 3000RPM at 12v though as that would be the better balance. The stock 3200RPM speed power-draw/heat-dump is still perhaps a fraction too high.
The other pump to consider would possibly be the RD-05H, rewired for 12v. Even though it has a peak flow rate of just 1.6gpm/6LPM, it has 8mH2O of pressure head. Even at 1.5gpm it's providing enough pressure head to drive a Storm plus a full-system 3/8" ID plumbed loop at that 1.5gpm. i.e. it's the sort of pump you'd buy if you wanted to achieve 1.5gpm with a minimum of fuss, size, and power-draw, for pretty much any system.
I do appreciate that the RD-05H is not the pedal-to-the-metal solution though that is obviously being sought after in this thread, but I still think it's something that should be considered.
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Thanks Cathar. I'll check into the cost on those as well. I'll post what they come up with and see if there is an interest for a group buy. If not, I'll just get a few standard RD-20s and have them rewound locally.