The following is a comparison  of each of the three Basement Watchdog Sump Pump Systems!

		A/C-D/C BWD12-120	Special BWS-12A	Emergency BWE-12A
Powerful
Pumping capacity (in gallons per hour at a 10-ft. lift)		2200 GPH	1730 GPH	1000 GPH
Efficient
Low power draw (in nominal amps at 12 volts)		10-12 amps	10-12 amps	6.5 amps
Approximate hours of continuous pumping with the Basement Watchdog 7.5 Hour Battery		7.5 hours	7.5 hours	12 hours
Approximate hours of continuous pumping with the Basement Watchdog Emergency Battery		N/R*	N/R*	6 hours
Runs intermittently for days		Yes	Yes	Yes
Strong
Tough, noncorrosive pump housing		Yes	Yes	Yes
Rugged, polyethylene battery box protects battery, floor and carpet...will not crack, corrode or shatter		Yes	Yes	No
Automatic
Switches instantly to battery power when AC power fails		Yes	Yes	Yes
Pumps when water volume exceeds main pump capacity		Yes	Yes	Yes
Recharges automatically when main power is restored		Quickly	Slowly	Slowly
Charges, then shuts off charger completely to prolong battery life		Yes	No	No
Limits current to prevent overcharging		N/A	Yes	Yes
Monitors battery & power conditions constantly		Yes	Yes	Yes
Daily test runs the pump		Yes	No	No
Detects irregularities, sounds an alarm and pinpoints problems and solutions on the control panel		Yes	Yes	Yes
Tests battery and actually displays the number of hours it will pump		Yes	No	No
Versatile
Pumps on AC power as well as battery power		Yes	No	No
Capable of pumping and charging the battery simultaneously		Yes	No	No
An alarm will alert you to these potential problems:
Battery needs water		Yes	Yes	Yes
Battery is old and needs to be replaced		Yes	Yes	Yes
Battery is discharged		Yes	Yes	Yes
Battery is defective		Yes	Yes	Yes
Battery cable is loose		Yes	Yes	Yes
Power plug is out of wall		Yes	Yes	Yes
Fuse or circuit breaker has failed		Yes	Yes	Yes
Battery is hooked up improperly		Yes	No	No
Pump is clogged or broken		Yes	No	No
Pump has been activated, check main pump for failure		Yes	Yes	Yes
* This battery is not recommended for use with these systems.