Then reinstall the TPR valve and blow-off tube. Refill the water heater. Turn on the gas or electricity. Enjoy clean, hot water! “Sediment buildup inside the tank can act as insulation ...

Hot water: The water inside your water heater is, well ... the more efficient it will be for cleaning or sanitizing. Do not go lower than 120°F, as this will cause bacterial growth.

A plumbing expert gets up on YouTube and gives a tutorial of how to clean out the sediment from your water heater. You've read ... This results in hot spots on the bottom of the tank.