Tankless Toilet Installation Made Easy | DIY Guide and Tips

March 25, 2024
DIY Guide: How to Install a Tankless Toilet

Written by: Deane Biermeier / Facts Checked by; Ryan Cullenward / Products Tested by Licensed Interior Designers

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Installing a tankless toilet in your bathroom is a great way to upgrade your space and enjoy the benefits of modern plumbing. This DIY guide will discuss the step-by-step process of installing a tankless toilet.  

Tools and Materials  

Before you begin, gather the necessary tools, including a wrench, screwdriver, and level. You'll also need the tankless toilet, wax ring, and water supply line. Remember to prioritize safety by wearing protective gloves and goggles.  


Start by shutting off the water supply to your toilet and removing the old fixture. Thoroughly clean the area to ensure a smooth installation process.  

Tankless Toilet Installation Steps

1. Positioning the Toilet Flange 

Align it with the drainpipe and secure it using screws or bolts.  

2. Connecting the Water Supply Line 

Attach the water supply line to the toilet's inlet valve, ensuring a tight connection.  

3. Attach the Tankless Toilet to the Floor 

Place the toilet over the flange, aligning the mounting holes. Secure it to the floor utilizing screws or bolts.  

4. Installing the Wax Ring 

Carefully place the wax ring on the flange, ensuring a proper seal between the toilet and the drainpipe.  

5. Securing the Toilet Bowl to the Flange 

Press the toilet bowl onto the wax ring, aligning the mounting holes. Secure it in place utilizing screws or bolts.  

6. Testing the Toilet for Leaks 

Turn on the water supply and flush the toilet multiple times to check for leaks. Adjust if necessary.  

Post Installation Steps

  1. Inspect for Leaks: After installing the tankless toilet, carefully inspect all connections, including the water supply line and flushometer valve (if applicable), for any signs of leaks. Address any leaks promptly to prevent water damage.
  2. Test Flush Functionality: Flush the toilet several times to ensure that it operates smoothly and effectively. Pay attention to the strength and consistency of the flush and make any necessary adjustments to the flushometer valve or water pressure.
  3. Check Stability and Alignment: Ensure that the tankless toilet is securely anchored to the floor and does not wobble. Adjust the bolts at the base if needed to achieve stability. Additionally, check the alignment of the toilet with the wall and adjust if necessary for aesthetic purposes.
  4. Clean Up: Clean up any debris or excess materials left from the installation process. Wipe down the exterior of the toilet with a mild cleaner to remove any fingerprints or smudges.
  5. Inspect Surrounding Area: Inspect the area around the tankless toilet for any damage or water leakage. Check for water pooling on the floor or signs of moisture on walls or baseboards. Address any issues promptly to prevent further damage.
  6. Test Additional Features (if applicable): If your tankless toilet includes additional features such as a bidet function or automatic flush sensor, test these features to ensure they are functioning properly. Refer to the manufacturer's instructions for guidance on testing and adjusting these features.
  7. Educate Users: Provide instructions to household members or users on how to operate the tankless toilet properly. Include information on flushing techniques, maintenance requirements, and any special features or functions.
  8. Monitor Performance: Keep an eye on the performance of the tankless toilet in the days following installation. Note any unusual noises, leaks, or malfunctions and address them promptly to prevent further issues.
  9. Follow-Up Maintenance: Regular maintenance is key to ensuring the long-term performance of your tankless toilet. Establish a schedule for cleaning and inspection, and follow the manufacturer's recommendations for maintenance tasks such as descaling and replacing parts.
  10. Enjoy Your New Toilet: Once the post-installation steps are complete, sit back and enjoy the convenience and efficiency of your newly installed tankless toilet. Appreciate the benefits of space-saving design, water efficiency, and modern features for years to come.

Finishing Touches  

Once you've confirmed no leaks, adjust the water flow to the desired level. Apply a bead of caulk around the toilet's base to provide a finished look and prevent water seepage. Finally, thoroughly inspect and clean up any excess materials or debris.  


Congratulations! You have successfully installed a tankless toilet in your bathroom. By following this DIY guide, you've upgraded your space and gained valuable plumbing skills. Enjoy the convenience and efficiency of your new tankless toilet. 

Disclosure: Sanitarysupply.org receives an affiliate commission on some, but not all, of the products we recommend—but only if you decide to click through to the retailer's site and make a purchase.

Deane Biermeier - A senior contractor and an experienced freelance writer - expert for reviews

Deane is an amazing freelancer with wide range of skills. He has good ideas and a prominent passion of writing. He is currently working on many websites including Sanitary Supply.

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