Cat® C18 ACERT™ Fire Pump Engines, with ratings: 447- 597 bkW (600-800 bhp)@ 1750-2100 rpm, meet U.S. EPA Tier 3 or U.S. EPA Tier 2 emission standards for stationary emergency fire pump engines. Rating: 522 bkW (700 bhp) @ 1500 rpm is Non-certified. All ratings are FM Approved and UL Listed. Starting on demand is a must for a fire pump engine - always. Cat® fire pump engines have a reputation for reliable starts and long efficient service. The C18 ACERT is the newest addition to the Cat fire pump engine line and continues the strong legacy of dependable starts and long, durable life.