THEY know what they're doing!
I bought a water heater, and the place I bought it had someone come out and install it. After ONE day, it stopped working!!! I called them back, and THEY said it was a "Manufacturer's Defect"... I called American Water Heater, and they said they would arrange to have someone out, and that they would be calling me. about 1:00, Sunshine plumbing called, and arranged to have one of their men out between 2:00 and 3:00... he actually made it by 2:45.. when he said everything had been installed wrong, I thought he was kidding! He wasn't... They made all the arrangements, and fixed it around the right way before 6:00 that night. From what a friend of mine told me, I was lucky.