The answer to 'when to replace pressure regulator' is that you should typically replace your home's pressure regulator every 5-10 years, or if you notice any issues like low water pressure or leaks. The pressure regulator is a critical component that controls the water pressure coming into your home, and over time it can wear out or become damaged, leading to problems.
It's a good idea to have a professional plumber inspect your pressure regulator during regular maintenance to ensure it's functioning properly. They can test the pressure and recommend replacement if needed. Replacing the regulator before it fails can help prevent costly water damage from high pressure or a complete loss of water pressure in your home.