Well, the new thermostat was supposed to be shipped UPS overnight from Eastern TN on Wednesday morning. It did not come Thursday or Friday so I called the tech folks. After checking the system they said the part was not shipped and in fact it is on back order. No estimates on when it will be in stock. Why could they no say that when the plumber was here and ordered the part. So they have authorized a new replacement unit. Of course labor will only be covered up to $150. Thankfully the place that sold me the tank has one and is working with me. Now I wait on the plumber. In my neck of the woods they only work 8:00 - 4:00 and only M-F this time of year and I left them a message at 3:30 on a Friday afternoon. It happens....after all it is Friday the 13th.