Quote:
Originally Posted by photo1902
My understanding of the code, is that on a replacement, if a water heater didn't have an expansion tank (prior to being required), and a replacement is installed, an expansion tank would be required. I believe this is similar to any retrofit, whether it's plumbing or electric. Of course I could be wrong 
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I agree, but I don't think a permit is required to replace a water heater, so plumbers can get away with it. The best thing for a homeowner to do is to require all potential installers to include the expansion tank in their quote.