Taking apart an old water heater and found this jacket - ripped to shreds, probably by the cat. Is it likely this contains asbestos or is it fibreglass?
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It's very likely fiberglass since that's what's been used in water heaters for many years. You didn't specify how old it is and if it's "ancient" there does exist that possibility. If in doubt, get it tested and properly disposed of by a licensed abatement contractor.
I suspect, however, that old is 10-15 years which is "forever" in water heater years and in that case there will be no asbestos.