Camcos 2500W 240V screw-in type low watt density water heater elements are better suited for areas with problem water (hard water, lime, etc.) Most LWD elements are a fold-back style and provide no loss of efficiency yet reduce lime deposit buildup. Screw-in type elements fit most models of American, AO Smith, Bradford White, Craftmaster (prior to 1991), GE, GS Wood (certain models), Kenmore, Lochinvar, Maytag, Mor-Flo, Reliance, Rheem, Richmond, Rudd, Sears, State, Whirlpool and all water heaters manufactured after 1994. The replacement element must be the same voltage and wattage as the element being replaced. Never exceed the nameplate rating on the water heater.