Mike Lamb 56 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 post Share on other sites
Tom Raymond 27 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 post Share on other sites
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