What to use to seal the hot water heater flue into the chimney?

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Old 11-04-16, 02:31 PM
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What to use to seal the hot water heater flue into the chimney?

Hello,

First off; thanks for any help in this question.

I'm replacing my hot water heater and will have to change out the flue. The old flue has what looks like concrete mortar around the flue opening. How would you guys go about removing this mortar and old chimney flue?

And what do you guys suggest to use to seal the new flue into the chimney?

Should I be using cement mortar again?
 
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Old 11-04-16, 03:57 PM
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What you probably have is called furnace cement. Removing it is fairly simple, perhaps similar to spackling paste. You can use a scraper and wire brush or similar tools. Make certain to wear a mask and goggles as you're likely to create a lot of dust. You can use furnace cement (easy to find) to replace the flue. However, whoever does the service on your unit may have to remove the flue to clean everything out. Thus, you may be better off just packing it with insulation.
 
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Old 11-04-16, 04:13 PM
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Furnace cement. But they are not created equal..

Use this.. If you can find it.. Or find a sid harveys near you.

William H. Harvey Company 10.3 fl. oz. Furnace Cement-045005 - The Home Depot


Branch Listing JERSEY


Anything else your wasting your time IMO..
 
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Old 11-04-16, 04:21 PM
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Thanks guys, I'll look for the furnace cement
 
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