We have a two year old hot water tank and it wasn't working. We called Roto Rooter in the morning around 9AM, they told us they would have a service man around 1 - 1:30. At 2PM I called and they said in a half hour more, at 3PM I called again and they said a half hour more, finally at 4:15 they arrived. They did replace the thermal couple in the tank and they were so very expensive. To change a thermal couple cost almost $200 dollars and the part was under warranty. I can't believe how long we waited (all day) for service and then what could we do at that time of day when we needed hot water. We had no choice but to pay the high "labor" charge. I don't know how they can get away with charging so much money. Everyone I spoke to about this thought it was awful and very very expensive for changing a thermal couple.