What Sun? Yes. but the cost of one is out of our price range and the reports on them are not flattering. The pond is big enough and deep enough not to need anything other than a decent set of pond weeds.
Oh .... I guess you would need sun, wouldn't you? :-D I did a lot of looking around for a smaller solar powered pump, and yes, they can be a tad expensive. But if it can take care of itself naturally, then that's even better!