Bill,
If you run 12 watts on AM, FM and digital then the supplied heatsink
(assuming it is the newer heatsink the wraps around the bottom of the
KX3) then it should be adequate.
If you want to run the full 15 watts on those modes, I would suggest
adding the Pro Audio Engineering heatsink for additional cooling of the PA.
Early versions of the heatsink had only a plate on the back which was
adequate for 12 watts on low duty cycle operation - Tx for 2 minutes and
then a RX period of about 3 minutes or more.
The KX3 will protect itself by reducing power if it gets too hot.
73,
Don W3FPR
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