Did you look at the printed gpm output and spec sheet, www.Basepump.com
or www.Zoeller.com on a 24 hr basis, its impressive. Go water powered
and get a cheap 2 stroke gas pump, Echo makes a good unit. Battery
powered are in my opinion not good, since batterys only last 5-7 yrs and
you wont know when they go bad, plus they dont pump much till they are
dead, only a few hours on New batteries.