The small Rulemate series pumps (up to 1100 gph) now come with an electronic water
sensor with no moving parts
in the bilge
will not turn them on. I have had one in my bilge
for more than a year and so far so good. I have heard complaints of them not shutting off.
I believe the Rulemate 1500 and 2000 still have float switches. I have heard complaints of switches sticking in either the on or off position. Two of my pumps have float switches but are not in the pump housing.
Rule also makes a line of pumps that turns it self on every 2-1/2 minutes. If it senses resistance against the impeller, it stays on until the water
is gone. These seem to be very reliable but in a small boat
, you hear it come on and it can drive you nuts. It's not a problem in bigger boats.
The switch that seems to have the best reputation is the Ultra Safety
System switches. Link: Ultra Pump Switch JR.