Anyone know what this could be? Trianco TRG 60

rogere84 · 2026-01-20T15:06:41+0000

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 could be.

A bit of (possibly) relevant information. The boiler was off from the 19th of December, until the 4th of January, as we were away. The chimney is open topped, but I'm unsure whether it would be water coming down the chimney, as I imagine I'd see it in multiple of them.

Any help is hugely appreciated

Wayners · 2026-01-21T09:00:22+0000

Will a magnet stick to it?

rogere84 · 2026-01-21T10:27:00+0000

Wayners said:
Will a magnet stick to it?

Honestly hadn't tried, but I kept the stuff I pulled out. Just checked with a magnet fishing magnet. No, a magnet doesn't stick to it.

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Anyone know what this could be? Trianco TRG 60

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