The owners of a home in the Phoenix, Arizona, area heard that you could reduce a gas water heater’s energy consumption by wrapping it in a blanket.  So
they took a blanket off the shelf and wrapped it around the tank, including the combustion air ports at the bottom and the vent at the top (see photo).  I explained to the owners about the danger of fire because the combustible
blanket was covering the hot gas vent, and about the danger of CO poisoning because covering the combustion air ports could cause incomplete fuel
combustion. I decided not to explain that the air gap between the blanket and the water heater made the blanket virtually useless. We removed the blanket. …




 


See: "What Were They Thinking?" by Bruce A. Barker. Home Energy, Sept/Oct, 2008



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