I wouldn't really want a switch or receptacle within easy reaching distance of the tub or shower. The control for my towel warmer is on the side opposite the tub/shower, so you'd have to reach over the towel warmer to get to it...it would be tough without getting out of the tub first. I think that there is a code requirement on the distance from a wet area, but don't have access to the codes easily. But, consider the location of a receptacle over a vanity with the sink right there...easy to reach the water and the electrical appliance at the same time...this is one reason GFCI protection is required.