3500w, 240v, 13.5 inches h, water screw in heater element, high watt density, 150+ watts per sqin, fits most models of american, a.o. Smith, bradford white, craft master, general electric, gs wood, kenmore, lochinvar, maytag, mor-flo, reliance, rheem, richmond, ruud, sears, state, & whirlpool heaters, gasket included, detailed instructions included, minimum tank diameter 14 inches, ul listed, 1 year warranty.