Cooling (no replies)

Hi, got this Sanguinololu, and now I am told that if I put a relais between the sanguino and the heatbed MKII, it is not necessary to put a cooler on the heatbed mosfet.

I'm also told that if I don't use the relais, I really have to put a cooler on the mosfet of the heatbed, located on the Sanguino board.

Is this true?

The wiring diagram I got is added to this message :)