Pad heaters

OREGON85

from OREGON
I originally posted this in the ATV section, but it's more of a general heating physics question. What would work best, a 25 watt pad heater permanently glued to the bottom/front of the motor or an inline coolant heater? The pad would be much more convenient and seems to me like it would be more effective. There is also a 50 watt pad heater but fitment might be more challenging. Anyone have any experience with these? It's a 600cc motor.

Here's a link to the 25 watt unit:
http://www.amazon.com/Kats-24025-Watt-Universal-Heater/dp/B000I8XDBM/ref=pd_sim_auto_4
 
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