Viqua Sterilight UV Water Purification System S2Q-P/12VDC 12 VDC 12 Volt DC model of S2Q-P Silver Sterilight UV Water Purification System Ideal for off-grid applications with required flow rates up to 3 gpm (11 lpm). A low maintenance system, and is easily serviced to ensure safe drinking water. 12-Volt DC draws approximately 17-watts.