True, due to our country's 50Hz power, our Iwaki pumps lose a lot of peak head, but also they draw less power and dump less heat into the system as a result too, in comparison to 60Hz power countries.
Still, given me experience with the 30RZ on 50Hz power, you really need good radiators (most likely more than one) to offset the amount of heat that the 30RZ will dump into your system.
If you're in a 60Hz power country, I would recommend the 20RZ at best. The 30RZ will likely overwhelm any performance benefit by raising the water temperatures enough to perhaps even more than offset what is gained through the higher flow rates.
The 60Hz 20RZ, with say 2 x DTek Pro cores, would be a better balance.
Since I also own an auto blower, that ranges in strength anywhere from ~100CM @ 10W power draw, all the way up to ~650CFM @ 280W power draw, I've also been able to notice the effects of fan heat altering the ambient temperature of the room enough to offset the benefits of increased air-flow.
When the fan is dumping an extra 200W of heat into the room, along with the pump dumping ~50-100W of heat, along with the CPU, one starts to notice the effects of all that heat on the room's ambient temperature, which directly affects the temperature of the air flowing through the radiator.
My honest advice if you want to chase the pointy end of pumps for water-cooling in a 60Hz country - grab an Iwaki MD-15R, or at most an MD-20RZ. Anything more and it becomes challenging to manage the heatload from the pump itself, and that includes the room temperature.
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