not knowing what type noise but most hot water tanks will emit some sort of noise in the heat cycle....kinda like boiling water nearest the heat sources.
Anytime after 10 years is good timing to keep an eye on their performance.
The last two I replaced were both over 13 years old and there was nothing wrong with either. I just wanted to be ahead of any potential problem.
Get the best deal you can on a heater then find someone to install it....I find is the best value.
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