The answer to 'when to replace toilet repair' is that you should replace your toilet when it is no longer functioning properly and repairs are no longer effective. Common signs it's time to replace your toilet include frequent clogs, cracks in the tank or bowl, constant running, and poor flushing performance. Older toilets that are over 10 years old may also need to be replaced, as they become less efficient over time.
Replacing a toilet is generally recommended when the cost of repairs exceeds the cost of a new toilet, or when the toilet is no longer meeting your needs in terms of water efficiency, flushing power, or comfort. It's best to consult a professional plumber to assess the condition of your toilet and determine if replacement is the best option.