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In case you've ever observed moisture dripping out of your heating system, you're probably asking what causes flue gas condensation and regardless of whether it's actually a problem for the tools. In simple terms, it happens whenever the hot fumes produced by burning fuel—like natural gas, oil, or wood—cool down enough to turn the water steam inside them into liquid water. This might sound straightforward, but there's a lot heading on under the cover that dictates exactly when and exactly why this happens. ...