I close all except the two cockpit drain valves (need to stay open to drain rain water).
I also have this remote monitor which will call my cell phone for high bilge water or low battery voltage. The company has been bought by Mcdermott Light and Signal. Gives me peace of mind if away from boat. Figure if I get high water alarm I can get to boat and solve problem before she sinks.
The unit is now monitored by:
Marine Navigation Lights by McDermott
Contact Mcdermott Light if you are interested in purchasing.
This unit has multiple normal open or normal closed contacts- you can wire these as an intruder alarm, smoke alarm, low temp, high temp or whatever you like. The unit will text message of the abnormal condition.