I'm confused as to why you would want to do this? I can not fathom a logical reason for needing a heater in any radiator hose. If your have a freezing issue, have someone check your antifreeze. incorrect water to antifreeze ratio such as having too much water, or worse, only water in the cooling system will result in a frozen hose, especially the lower one, as it tends to be more exposed to the elements from under the vehicle.