Closed couple combined bidet toilets are most common toilet types where cistern sits on top of the pan. It makes the toilet looks more compact and they are easy to install. It can be positioned anywhere in bathroom and easily replace the existing toilet. Closed couple combined bidet toilets come with two type; open back and close back. If the pan does not flush with wall, it is open back model, it allow waste pipe to connect from side as well as from floor or wall. The other model is close back, where pan is fully flush to wall, it only allows waste pipe to connect from floor or wall.