Expansion Tank or Thermal expansion bypass valve

Expansion Tank or Thermal expansion bypass valve?

Customer is replacing (2) 80 gallon electric water heaters and he would rather not use expansion tanks due to previous tank failures, I suggested the bypass valve & pipe discharge to outside. http://www.supplyhouse.com/Watts-037...gaAgg-EALw_wcB
Any pro or cons or suggestions?
Via RSSMix.com Mix ID 8247361 http://www.rssmix.com/

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