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    Richard Bosetti's Avatar
    Richard Bosetti Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 11, 2008, 05:09 PM
    Black soot on boiler casing
    My hot water heating boiler is covered with heavy coating or black soot inside the boiler casing. I would like to know what is causing all this soot. There is hardly any soot built up in the exhaust flue.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Nov 11, 2008, 06:20 PM

    It is a natural gas, propane or oil burner? If oil burner, this is just the way it is, they are messy, if natural gas or propane, you have incomplete combustion. Let me know and I will try to help.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Nov 11, 2008, 09:04 PM
    Running the boiler to cold or having to cold a return water temperature will cause the boiler itself to accumulate the soot.
    Nuairsaul's Avatar
    Nuairsaul Posts: 1, Reputation: 1
    New Member
    		  
    #4

    Dec 6, 2011, 08:17 AM
    What will case the boiler to soot up
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