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I've been figuring 10 years is about the safe limit. At that point I put in a new one. I think if you don't have a "closed" water system an expansion tank is not needed. BTW - I recently installed a system that uses the cold water pipes as a path for recirculating hot water to reduce waiting for hot water at the sinks/etc. It works very well.
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Sold: 1989 3.2 coupe, 112k miles
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