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I have the E3D heat sink fan connected always on - as it is a very low noise fan (Noctua NF-A4x10 FLX 40mm fan).
Fan power is taken from +12V and 0, but I can't guide you with the original K8200 board, as I replaced mine with a RAMPS 1.4 board some time ago.

I recommend using the low noise 40mm fan version (http://www.thingiverse.com/thing:636715), with Noctura or similar. To my knowledge all 30mm fans are noisy.

K8200/3Drag E3D v6 HotEnd extruder mount for 40mm fan
by Area51