Yesterday morning I called QDI to replace my hot water heater system and they were at my house at 1:00PM. Their service technicians were very polite and professional. They explained to my wife and I what they were going to do and answered all our questions. After completing the install they cleaned up the work area and we have hot water again. Matej, Cole and Steve did a great job and I would recommend them to my family, neighbors and friends.