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Turn off the heat
If the outside of your water heater is warm, you may need to consider insulating it before the temperature goes down and the burner has to work in overdrive. Be sure to wear protective gear, including gloves, masks and eye wear before starting the process. To begin with the insulation process, turn off the heat first from the circuit breaker.Get rid of any dirt
Look for any debris or dirt on the top of the tank and wipe it off with the help of a rag. Dirt or debris may cause a hindrance while taping the blanket, and can even lead to corrosion in the long-term.Measure the blanket to the size
Take the insulation blanket and measure it up to the top of the water heater. If it’s a gas water heater, make sure there’s room for the exhaust to release gas. In the case of an electric water heater, be sure not to cover any of the heating element controls, like the drain valve and the pressure relief valve.