Mike Lamb Posted October 30, 2017 Report Share Posted October 30, 2017 (edited) This is a blind shot I took of a 20-year-old gas-fired boiler. I see scorching above the top of the heat exchanger. Do you think this is cause for concern? Would a dirty exchanger cause this? Edited October 30, 2017 by Mike Lamb Quote Link to comment Share on other sites More sharing options...
Tom Raymond Posted October 31, 2017 Report Share Posted October 31, 2017 Where is the refractory insulation? I'm betting what scorched is the adhesive left behind when the rats stole the insulation. Quote Link to comment Share on other sites More sharing options...
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