The answer to 'water heater installation replacement frequency' is that most water heaters need to be replaced every 8-12 years on average. This timeframe can vary depending on the type of water heater, quality of installation, and local water conditions. Properly maintained gas or electric water heaters typically last 10-15 years, while tankless water heaters may last 15-20 years with proper care.
It's important to monitor your water heater's performance and age, and replace it before it fails to avoid potential water damage and disruption to your home's hot water supply. Signs it may be time to replace include reduced hot water capacity, strange noises, or visible corrosion. Calling a professional plumber to inspect and assess your water heater is recommended when considering a replacement.