Tar like substance forming in the firebox of my peerless boiler.

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3

35kl199

New Member
Nov 29, 2017
1
NY
Any ideas why would a hard tar like substance form in the firebox?
Recently installed new Riello 40 oil burner, new fuel oil tank 275 gallons, and 10 year old peerless boiler.
Thanks for any help.
[Hearth.com] Tar like substance forming in the firebox of my peerless boiler.[Hearth.com] Tar like substance forming in the firebox of my peerless boiler.
 
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