Natural gas escapes from water heating systems through leaks and because some is not combusted by the burner. These tiny inefficiencies can add up: The resulting emissions of methane—a powerful greenhouse gas—for water heaters across the United States are potentially more than three times higher than expected, according to a new Stanford study. The good news, however, is that simple fixes are available that can be applied across most of the world’s economies.
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Source: Phys.org