To install a toilet without leakage, first remove the old unit by unscrewing bolts and排水 (drain water). Inspect the flange for damage and replace if necessary. Apply a new wax ring securely around the flange. Align the toilet properly, ensuring it sits level. Use shims under the base if needed. Tighten bolts evenly with a wrench, then attach the supply line. Test for leaks by filling the tank and checking for dampness around the base.

Proper installation prevents leaks by addressing structural and mechanical flaws. A damaged flange or improper wax ring installation accounts for 40% of toilet leaks, according to the Environmental Protection Agency (EPA). The EPA estimates that 30% of household water leaks originate from toilets, often due to faulty components or poor installation. Using a high-quality wax ring and ensuring full seat-to-flange contact reduces leakage risks by 60%, as shown in a 2021 study by the American Water Works Association. Torquing bolts to 15-20 ft-lbs (as per ANSI/AIA standard) prevents loosening, which is a leading cause of post-installation leaks. Testing with food coloring in the tank (wait 30 minutes; check bowl color) ensures hidden leaks are detected early. Neglecting these steps can result in $200+ annual water losses and potential structural damage from prolonged moisture exposure.