Searching for Sealant for Dunkirk Quantum 90 cleanout plates

Old 10-21-13, 09:54 AM
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Searching for Sealant for Dunkirk Quantum 90 cleanout plates


I have about a high efficiency boiler (Dunkirk Quantum 90) which is about 10 years old. I use propane gas for fuel, and the boiler calls for annual cleaning. I like to clean it about every 2 years.
In order to clean the firing chamber, you have to remove some plates on one side of the boiler. Then you can wash the area out with a hose. Cleaning, you need to seal the plates with a high temperature sealant.
I had a furnace guy help me the last time we did it, and we used a red paste sealant. The whole process was pretty simple, so I'd like to do this myself. However, I can't figure out how to get the sealant! I'm not exactly sure what specs I need and there is not much on the internet about this when I search around. The furnace guys seem to keep this info pretty unavailable to the do it yourselfer. Don't understand why. Can anyone tell me what sealant I can get myself to do this cleaning process?

Ian K
Old 10-21-13, 11:37 AM
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High temperature silicone sealant is readily available from auto parts stores and sometimes in the automotive section of department stores or hardware stores. Be sure to clean off all the sealant from prior use before adding the new sealant.
Old 10-21-13, 05:17 PM
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the boiler calls for annual cleaning. I like to clean it about every 2 years.
If the manufacturer calls for ANNUAL service, why do you reason it's OK to do it ever TWO?

Do you have the manuals for the boiler? If not, then download, read and understand what you are doing.

The instructions for burner maintenance and cleaning (page 48) don't say anything about a 'sealant', but do mention a 'gasket'. It doesn't appear to me that the manufacturer call for a sealant here...

There IS a mention about 400 high temp silicone sealant, but not in the BURNER maintenance and cleaning section. This mention is on the previous page (47) in section 1. G. in relation to the seals between boiler sections.

G. Check silicone rubber seals between boiler sections.

Insure that there are no leaks. Use RTV silicone
rubber adhesive sealant rated for at least 400 F to
replace or repair seals in locations where original
seals have deteriorated.

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