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Thanks a lot for this Madrab. Doing my research an actual ufh leak would be pretty obvious but it's really odd it's changing colour/ shape after 8 years. It looks like a oily wood stain job gone wrong....

I spotted this dark stain on my wood floor around 3 weeks ago, last time the underfloor heating was on was in December. Yesterday I switched it on again and it seems to be getting bigger. The stain is dark, no cupping or crowning, no sign of water or moisture. Any ideas whether it's a chemical...