Here are some important things to know when choosing a toilet for your bathroom or powder room. Two of the most important considerations are:
- where is the water going to come into the toilet (water inlet)?
- where is the waste going to go (waste trap)?
The diagram below shows possible water inlets and waste traps to help you decide what will work best for you. If you want to avoid changing the existing plumbing, you will need to make sure your new toilet inlet and outlet fits the old pipework.

Water Inlet
Water can come into the cistern from one of two places. Rear entry is where the tap is inside the cistern and bottom inlet or entry is where the tap is in the wall beside the toilet.
Waste Trap
For the waste leaving the toilet, P-trap refers to a sewerage pipe through the wall (think p for plaster). S-trap is where the sewerage goes through the floor (think s for sewerage).
Setout
A commonly used measurement to help align your new toilet is the setout. This refers to the distance to the centre of the waste outlet.
S-trap setout = the distance from the finished wall to the centre of the waste pipe in the floor.
P-trap setout = the distance between the finished floor to the centre of the waste pipe in the wall.
Make sure you know which trap will fit your existing plumbing and the setout distance before purchasing a toilet.
Other Factors
With hundreds of toilet suites on the market, it can be quite confusing and difficult to make a decision. Once you have the technical requirements down, the most important thing is that you choose a toilet that makes you feel comfortable.
You may like to consider the type of toilet, its efficiency, the size, or just the one that looks best to you.
If you need any help or have any questions, feel free to ask our friendly customer experience team or head over to our toilet FAQ page.