Right 60Hz, it was a typo
Never knew when you're stuck in the hotel you tend to type "6" as "7" lol.
Heat wise the resun MD55, you can put your hands on the pump body for 4-5 sec, after that if you can still tahan means your skin = very thick.
It is fan cool btw and pretty quiet for my standard.
I've no experience ($$$) on the iwaki so can't comment.