Types of Water Closet and Toilet System:
Close-Coupled Water Closet
It is also called two-piece toilet bowl. It consists of the bowl and cistern on separate body. One of the advantages of close-coupled water closet is that with proper mounting kit which allows tightening of the screw sets from inside of the the cistern to keep the cistern and bowl together, the replacement of the water inlet valve can be achieved without removing the whole toilet bowl. It just requires to unmount the cistern by unscrewing the screw set from inside the cistern and the inlet valve can then be replaced easily.
One-piece Water Closet
The bowl and cistern are together in one body. Generally, it is seen to be more elegant than a close-coupled toilet bowl. For one-piece water closet, the water inlet valve can only be removed by unscrewing the nut from underneath the cistern. In most cases this is very hard to achieve especially when the space is very tight at the side of the water closet which is commonly found in most toilets these days.
Wall Hung Water Closet
A toilet bowl mounted on the wall. The flushing system is either concealed behind the wall or “boxed-up”. There are a few types of flushing system for wall hung water closet. It usually uses concealed cistern in residential developments. For commercial places, it usually has a flush valve system. The waste pipe for wall hung toilet bowl is usually on the wall.