If you would be interested at the right weight worth getting an accurate answer. If he has the handbook as it shows in the listing he can look it up for a definite figure.... or he could put it on the bathroom scales.
I've found two other listings for this model for sale in the USA where they say 59 or 60 lbs.... which is about the 27kgs mark I'd have guessed.
Sadly yes it is a bit for an 8. My 15 weights 34kg and that's a little over a comfortable figure to lug about but at least you have the power as a bonus.
I find myself looking around for something that might way 32 kg, just to see if it is workable, but not knowing how far it might be from the car to the launch point, or what the sea state might be, is making me hesitate a little