Can a microwave oven be used for home canning?
A microwave oven cannot be used for home canning. Low acid foods must be processed at 240 degrees F; a microwave can only reach 212 degrees F. Even acid foods must have the uniform heat provided by a conventional water bath canner. Because of its uneven heating pattern, a microwave oven does not assure consistent heat to each jar during processing. There is also a danger of the jars exploding as the molecules in the food are moving faster which results in a vigorous rolling boil. Explosion may occur as food is being removed from the oven.
Barbara Willenberg, Nutritional Sciences, University of Missouri Extension
Last update: Wednesday, August 10, 2011