2 pumps - excellent advice
I have a second one used as a shower pump. I have it, along with a float switch, mounted on a metal plate. When we leave the boat for extended periods of time, I take the plate from the shower sump and put it into the bilge, giving a backup pump. Both pumps are Rule 2000. It's a bit of an over kill for a shower pump, but not for a bilge pump.If you are away from home I'd suggest taking an extra one or two as spares. You never know when you might need one. I was surprised how many people we ran into in The Bahamas who had no spares. Like this guy:http://www.geocities.com/rainbow_chaser.geo/tomcat.html