I have a manual and two electrical bilge pumps. Both of the electrical pumps are smallish. Nothing wrong with the hand pump but if I should experience a half-way serious amount of water coming in, I would like to take care of stopping it rather than sitting on the cockpit bench manning the hand pump. So, I decided I need some emergency de-watering system. For reference, we are talking a 32' boat here.
I am looking mainly at Shurflo since Practical Sailor ranked them highest but I suppose the following applies to other brands, too. I could buy a hulking big centrifugal pump, like 4000GPH or so. I would not want to install it permanently but keep is easily accessible and only deploy it (=throw it in the water-filled bilge) in case of substantial water ingress that my regular pumps cannot handle.
But the price structure of bilge pumps is weird: the cost for a 1000GPH Shurflo is about $35.- while a 1500GPH costs about $100.- So my first question: Is there anything wrong with buying a few smaller pumps rather than a big one? It is cheaper and I get redundancy (aren't we sailors supposed to always have redundant systems?). So, I would buy 2 or 3 of these pumps, mount them on a board with electric cables attached to them. The other end of the cable will have large alligator clamps (like from a re-purposed car starter cable) ready to clip on a battery.
My second question: Is there anything wrong using collapsible discharge hose for the pump(s)? Like this (but there are many others, for pool use, agriculture etc) Watts 1-1/2 in. I.D. x 150 ft. PVC Flat Discharge Hose-RCDR - The Home Depot
Takes very little space compared to rigid hose, it is not too costly, and made exactly for, well, discharging water, which is what a bilge pump does. Each pump would have its hose permanently clamped to its outlet with a hose clamp, ready to go. To start emergency de-watering, I would only have to attach the alligator clips to the battery, put the board with the pumps in the water and throw the other end of the hoses over board.
Anything wrong with these two ideas?