As usual, mmy tank failed at the most inappropriate time. After working in my yard all day, i needed to shower and go to visit someone in the nursing home. Flipped the shower on, and no hot water. Meantime, a bad weather alert for a tornado was in the area. I called mark johnson plumbing, the tech was very helpful and had someone come out at 8 the next morning. By 930 i was enjoying my hot shower. The tech had completed the swap, added an expansion tank, and cleaned up everything and haualed all the waste away. Highly recommend their company. Thanks guys!