we purchased the 10qt xl cooker to do canning and we live above 5000ft altitude. So we had to return it as it was unable to work above 2000ft. We have since repurchased a 6 QT and received that today. Potential buyers should be informed before buying the restriction on altitude for canning as that was the main purpose we bought. We are waiting on a refund from the first purchase and feel it fair that the shipping should also be reimbursed since we are paying shipping again on the second purchase. We are a family of two so 6 qt cooker was large enough for everyday meals. Dorothy Ludaescher