There is no noticeable difference between the two models. In fact, the Kenmore 87531 also features 6 standard cycles (casual, damp dry, delicate, heavy duty, normal, 80-minute timed dry), 6 special cycles (express dry, jeans, large items, sensor dry, touch-up, 90-minute Wrinkle Guard), and 6 temperature options. In fact, the Wrinkle Guard cycle was specifically developed by Kenmore to relax clothes and keep them wrinkle free. In addition, the Kenmore 87531 comes equipped with 4-way venting, an end-of-cycle signal, a QuietPak 4 package, a clear window door, and a dial with tap touch controls. The Kenmore 87531 retails for $799.99 (same as the 87511) and can be purchased at either Sears or K-Mart. Although the Kenmore 87531 comes with a 1 year limited warranty, extended 3YR and 5YR In-Home Master Protection plans are available for a fee.