The answer to 'water heater installation clogged' is that a clogged water heater is often caused by sediment buildup in the tank. This can restrict water flow and prevent the heater from functioning properly. Symptoms may include reduced hot water output, strange noises, or the heater taking longer to heat up.
To address a clogged water heater, you can try flushing the tank to remove sediment. This involves draining the tank and running water through it to flush out the buildup. However, if the clog is severe or you're uncomfortable performing this task, it's best to call a professional plumber to inspect and service the water heater.