The answer to 'how to maintain water heater installation' is to perform regular maintenance and inspections to ensure your water heater is operating safely and efficiently. This includes flushing the tank, checking the anode rod, testing the temperature and pressure relief valve, and insulating the tank and pipes.
It's recommended to flush your water heater tank every 6-12 months to remove sediment buildup, which can reduce efficiency and lifespan. The anode rod should be inspected annually and replaced when it's heavily corroded. The temperature and pressure relief valve should be tested every 6 months to ensure it's working properly. Insulating the tank and pipes can also help improve energy efficiency and prevent heat loss.