Does the noise of the fan coincide at all with the heater or AC going on? If so, the breeze from the ducts may be causing a vibration of the fan blades.
A 50-year old water heater is already four lifetimes old. Replace it and be thankful for every year of life it gave you after its twelveth. As far as adjusting the temperature, they're pretty straightforward on all water heaters I've seen - there are arrows pointing one way saying, "hotter."
You can buy tubes of adhesive at Home Depot for the linoleum floor tiles.
As for the 220 (probably) plug - what room is it in? Sounds like it could be for a dryer; but perhaps an electric stove, too. They look very similar.
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If you want to avoid 95% of internet spelling errors:
"If your ridiculous pants are too loose, you're definitely going to lose them. Tell your two loser friends over there that they're going to lose theirs, too."
It won't hurt your fashion sense, either.
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