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Indirect DWT Viessman Vitocell 100 - 17yrs old - precautionary replacement?

My 17 yr old Viessman boiler is in need of replacement. Zero concerns with the 17 year old Vitocell 100 indirect tank other than the age. Looks like the Vitocell 300 has a lifetime warranty but my Vitocell100 has 8 years. I hate the thought of replacing what seems to be a perfectly good tank but also want to be prudent if it is suggested. Much appreciate any advice.