Water heaters' methane leaks are high, but fixable

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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