A double weatherproof socket would be recommended as one thing that people are into now are water features that have electric pumps integral to their design.

I'd check with the local inspector / Building department. Because of the size and being completely surrounded by the house they may consider it a room and the rules of 210.52 would apply.
As a minimum design consideration a WP receptical would be recommended, but not required.
Bubble covers are not required by the Indiana Electrical Code, unless they supply an unattended load.
Alan--

Whats a bubble cover ? ?

Kiwi,

They are a clamshell like cover designed to allow a cord to exit a outdoor receptacle and still keep the weather out.

Try this link
http://www.intermatic.com/images/misc/capability%20brochures/Weatherproof.pdf

[This message has been edited by Jim M (edited 05-22-2006).]

Is it a habitable room?

Is it the front, or rear of the house?

Any air conditioning equipment, unfinished basements, or kitchen countertops nearby? LOL

Then I don't see a requirement for any type outlet.