Our ETS systems gain efficiency by taking advantage of off-peak electricity, which is charged at a lower rate since it is consumed during times when demand on the electrical grid is low. Steffes ETS systems convert this off-peak electricity to heat and store it in heating elements contained within high-density ceramic bricks. With Steffes ETS systems’ ability to store vast amounts of heat for long periods of time, you can get on-peak performance for an off-peak price.