In battery operated systems, which are the most commonly preferred backup, a battery drives a direct current pump that removes the water once a high water level is reached. In addition to the pump, these systems consist of a separate float system, trickle charger for the battery and an alarm system.
Also on the market are water pressure sump pumps that use household water pressure to operate the pump. No electrical hookup is required for the operation of this system. A water line is connected to a valve that is attached to a float alarm and when activated releases a stream of water that turns the impeller in the pump, thus discharging both the household water supply to the unit plus the water building up in the sump.
Battery backup sump pumps are readily available at hardware and home center stores and they are fairly inexpensive.
For more information, e-mail Ken Ford at NAHB or call him at 800-368-5242 x8228.
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