trg60

Went to clean the fins inside my boiler today and pulled this nasty stuff out of one of them. Only one fin has it. Originally thought it could be tar, but given I'm burning anthracite, I don't believe that to be the case now. Not sure what it is, or whether anyone has any advice on what it...

We recently purchased a house with a Trianco TRG 60 boiler, burning anthracite. A couple of weeks after we moved in, the old owners visited and gave us an overview of the fire, and looking after it. Jumping to the point here, they advised us to clean these little vents under the flap cover...