If you're not getting a LOT of water, you can get a boat bilge pump. They do the same thing.

But if your house is filling up rapidly, that's not going to help.

I have a small bilge pump I keep with some hose and a solar panel. I used it to finish draining the hot tub recently when I couldn't get all the water out of the bottom through the normal drains. Worked well. In fact, it probably could have drained the whole tub using a solar panel and the pump and a hose about an hour and a half LESS than letting it drain on it's own. Maybe even quicker.