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What is this rock like lining material in my old oil burner boiler? lava rock cement? ceramic?
Hello heating help friends!
I was wondering if some of you who have experience having the privileged of working old steam boilers that were converted to oil from coal.
As you can see there is a rock like material insulating, protecting the boiler hitting oil fire directly on the metal box.
As you can see there some rock like substance has come out over last 70 years of its life.
(Q-1) Anyone know what is that rock like material made out of?