Replacing an existing toilet is a straightforward task because the supply and waste pipes are already in position. If you want to install a toilet in a new position, it requires more complex rerouting that is best done by a professional plumber.
Before you begin gather the right equipment. You will need newspapers or old towels to set the toilet on after you remove it. A mistakenly dropped toilet could crack a ceramic tile floor. Also, make sure the new toilet fits inside the space occupied by the old toilet. Some newer models are available in longer and larger sizes than traditional designs and may not fit within the room.
Shut off the water supply to the toilet. After the water supply is disconnected, flush the toilet several times. Flushing repeatedly will remove the water from inside the tank and most of the water from the bowl. If there is any water left in the bowl, use a container to scoop it all out. If you leave any water in the old toilet it may leak out when you carry it through your home to dispose of it.
Use a utility knife to score the between the bowl and the floor and then free the toilet by rocking it from side to side. Lift the toilet away onto some old towels or newspaper. Remove the wax gasket using a putty knife or similar tool. Block the drainpipe with a rag to prevent sewer gas escaping.
Insert a new wax gasket on the outlet of the new bowl. The tapered side faces away from the bowl. Double check that the toilet flange is tight and not corroded. The toilet flange helps make a tight connection between the toilet and the waste pipe. The flange sits on top of the floor and connects to a collar that fits through the floor. Historically the flange was secured in place with putty, but today there are several plastic flange gaskets to choose from.
There are also several type of wax rings. Some have a plastic insert that is used to direct water flow (Image 1). A wax gasket with an insert #10 is thicker, which provides a good connection when remodeling the bathrooms in older homes or if the flange is set low (Image 2). For most situations, wax gaskets without plastic inserts (Image 3) can provide a suitable seal against sewer gases.