You would NOT have a backflow issue since impeller pumps are positive displacement. One big advantage of the impeller system is the suction hose could be routed to the very lowest point in the bilge sump. Impeller pumps are self priming down a few feet. While the float switch would shut off before complete emptying, you could empty the sump on "manual".
With a typical centrifugal pump, you can only lower the water level to the inlet of the pump. Don't know about your boat, but on Touche', that leaves a bunch of water in the sump. The only way I can empty it is with the manual pump. Disadvantage might be trash damaging the impeller. However, impeller pumps are widely used for bilge pumps on many, many boats. There was one on Touche' when I bought it. I stupidly replaced it with a centrifugal pump. :( Should have left it. Dennis On Tue, Jan 15, 2019 at 2:40 PM Richard Bush via CnC-List < cnc-list@cnc-list.com> wrote: > Dennis, I like your suggestion of the Ultra Safety systems switch and the > water > puppy pump; that's about $300.00 (+/-); what would the advantages (or > disadvantages) be over the traditional systems...? > How would the hose be routed? Would you still have the backflow problem? > Thanks > > Richard > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
