Can be run safely when dry. Shuts off automatically if motor overheats. Special valve prevents back-flow and damage from high city water pressures. Quiet, high-torque 12-volt DC motor with permanently lubricated ball bearings. Easy to service. CSA (Canadian Standards Association) and IAPMO listed. For systems with 1 to 5 fixtures. 2 sizes: 1.1 and 3.2 gallons per minute. 2-year limited warranty.