Iconic design and inimitable cooking performance aside, the beauty of this cooker is that it takes full advantage of off-peak electricity, storing it through the night in specially designed heat bricks located deep inside the cooker. The stored energy is then used to heat your AGA Cooker throughout the day. Like all AGA cookers, the 4-oven Electric AGA Cooker is made of cast-iron. It's this iron that radiates the heat through its ovens and hotplates, allowing it to always be instantly available for use and preventing food from drying out, while retaining goodness and enhancing natural flavors. The ambient heat it provides keeps kitchens and even adjoining rooms deliciously warm.