This Center 2 Channel Electronic Programmer is a brand new unit that is perfect for your heating system needs. It has a digital display, is wired and programmable, making it a great addition to your home. The unit can be mounted on the wall and is designed for point-of-use application. The heater is electric and has an energy efficiency rating that is unknown. It is a standard water heater that is ideal for your home. The unit quantity is one and it is a modified item, but it is not specified what it was modified. The product is of high quality and you can rely on it to provide you with hot water whenever you need it.