The answer to 'how to maintain water heater installation' is to perform regular maintenance and inspections to ensure the water heater is functioning properly and safely. This includes flushing the tank, checking the temperature and pressure relief valve, and inspecting the anode rod.
It's recommended to flush the water heater tank every 6-12 months to remove sediment buildup, which can reduce efficiency and lead to premature failure. The temperature and pressure relief valve should be tested annually to make sure it's working correctly. The anode rod, which helps prevent corrosion, should be inspected every 2-3 years and replaced if it's heavily corroded.