It provides efficient heating with 50W per SQIN and fits most models of American, A.O.Smith, Bradford White, Craftmaster, General Electric, GS Wood, Kenmore, Lochinvar, Maytag, Mor-Flo, Reliance, Rheem, Richmond, Ruud, Sears, State, & Whirlpool Heaters. Ideal for areas with high mineral content, it withstands dry firing and heats through lime and sand buildup that would burn out ordinary elements. Constructed from the highest grade nickel and chromium , this element offers ultra-low watt density for long-lasting performance. UL listed and backed by a limited lifetime warranty.