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Old 07-16-2012, 10:46 PM   #1
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Chimney Venting


I recently put in a high efficiency furnace that used to be vented through my chimney. Some contractors wanted to put in a chimney vent because my hot water heater is still venting through the chimney. I have a clay liner in my chimney. Do I need to put in an additional liner?

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Old 07-16-2012, 11:20 PM   #2
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Chimney Venting


yes, you should. The clay liner is too big and water heater flue gases will condense inside the chimney and rot it out. You really should have a liner installed!

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Old 07-17-2012, 12:25 PM   #3
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Chimney Venting


I agree, the exhaust from the hot water heater will deteriorate the mortar and clay liner, and you should install a liner. For most water heaters a 3" or 4" is all you would need. The size is calculated by the BTU's of the heater and the height of the chimney, and there should be a cap installed if you do not have one already.
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