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I just installed one on my 15 ft SS for when I leave it docked overnight and in case it rains. This happens about once a year when I take the boat with me on vacation.

The Rule Automatic Bilge Pump, model 25S fits in the bilge perfectly and does a great job of quickly emptying any water in the boat. You must, however, install a switch that disconnects the pump from the battery when not in use. In the automatic mode, the pump turns on every 2.5 minutes for about a second to sense for water (there is no float switch). Rule claims that it only draws about .5 A in 24 hrs doing this check, but this would add up over time and kill your battery. I used the Shoreline Marine Bilge Pump 3 Way Switch. I got both the switch and the pump from Amazon for a total of $75.

Lastly, was deciding where to pump the water to; the splash well or over the side. I decided to take it overboard and used some std pump tubing, a couple of 90 deg elbows and a plastic conduit clamp from Home Depot so I didn't need to worry about installing a through-hull.

Check out the pictures in the link below.

https://plus.google.com/108704537003663470221/posts/Fy923TJdCsn