how to install a tankless toilet

How to Install a Tankless Toilet

Tankless toilets are becoming increasingly popular due to their space-saving design and water-saving capabilities. Unlike traditional toilets that rely on a tank to store water, tankless toilets directly connect to the water supply, providing a continuous flow of water for flushing. If you’re considering installing a tankless toilet in your home, this guide will walk you through the installation process step by step.

Section 1: Gather the Necessary Tools and Materials

Before you begin the installation, it’s important to gather all the necessary tools and materials. Here’s a list of what you’ll need:

1. Tankless toilet kit: This includes the toilet bowl, seat, and all the necessary components for installation.

2. Adjustable wrench

3. Screwdriver

4. Pipe cutter or hacksaw

5. Teflon tape

6. Plumber’s putty

7. Level

8. Measuring tape

Make sure you have all these items on hand before you start the installation process.

Section 2: Prepare the Area

The first step in installing a tankless toilet is to prepare the area where it will be installed. Start by shutting off the water supply to the existing toilet. Locate the shut-off valve near the base of the toilet and turn it clockwise until it stops.

Next, remove the old toilet by disconnecting the water supply line and unscrewing the bolts that hold the toilet to the floor. Carefully lift the toilet and set it aside. Be prepared for some water to spill out during this process, so have towels or a bucket ready to catch any excess water.

Once the old toilet is removed, inspect the flange on the floor. If it’s damaged or worn out, replace it with a new one. The flange provides a secure connection between the toilet and the sewer pipe.

Section 3: Install the Tankless Toilet

Now it’s time to install the tankless toilet. Start by placing a wax ring on the flange. The wax ring creates a watertight seal between the toilet and the sewer pipe. Make sure the wax ring is centered on the flange.

Next, carefully lower the toilet bowl onto the wax ring, ensuring that the mounting bolts pass through the holes in the base of the toilet. Apply downward pressure to compress the wax ring and create a tight seal.

Once the toilet bowl is in place, secure it to the floor by tightening the nuts onto the mounting bolts. Use a level to ensure that the toilet is perfectly level and adjust as necessary.

After securing the toilet bowl, attach the water supply line to the fill valve on the bottom of the toilet. Use an adjustable wrench to tighten the connection, but be careful not to overtighten and damage the threads.

Section 4: Test and Adjust

With the tankless toilet installed, it’s time to test it and make any necessary adjustments. Turn on the water supply and check for any leaks around the connections. If you notice any leaks, tighten the connections or apply plumber’s putty as needed.

Flush the toilet several times to ensure that it’s working properly. Check for any issues with flushing or water flow. If necessary, adjust the water level in the tankless toilet by following the manufacturer’s instructions.


Installing a tankless toilet can be a straightforward process if you follow these steps. Remember to gather all the necessary tools and materials, prepare the area, install the toilet properly, and test and adjust as needed. If you’re unsure about any step of the installation process, consult a professional plumber for assistance. Enjoy your new tankless toilet and its space-saving and water-saving benefits!

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