Saves time, energy and water! Requires only 2 quarts of water as it steam-cooks fresh and frozen foods. Cuts preheating time by 50% over water bath canning and eliminates heavy lifting. Steam is hotter and more efficient than boiling water, killing enzymes that can attack flavor and texture of canned fruits. A built-in temperature indicator on the lid tells you exactly when to begin processing time. The base and rack make an excellent roaster. Aluminum construction ensures quick heat-up and cool-down times. Not recommended for low-acid vegetables and meat. Ideal for tomatoes, fruits and other high-acid foods.