Flushing your water heater regularly is important for its performance and longevity because it helps remove sediment and minerals that can build up over time: 

• Improved energy efficiency: Flushing removes sediment that can insulate the tank and prevent heat from transferring to the water. This helps the water heater run more efficiently and use less energy. 
• Longer life: Well-maintained water heaters can last 12 or more years. 
• Reduced corrosion: Sediment buildup can cause fittings and valves to rust over time, which can lead to cracks and leaks. 
• Safety: Scaling can block the pressure-relief valve, which prevents pressure from building up in the tank. 
• Better water pressure: Flushing can help improve water pressure. 

You should drain and flush your water heater at least once a year, and ideally twice a year. If you haven't flushed your tank in over a year, it's best to have a professional handle the first flushing.