Water Heaters - Extended Life

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our water heater is 15+ years old, never been flushed, but is protected by a whole house rust and sediment filter.   accoding to this website  http://www.waterheaterrescue.com/  , the home owner can do a number of things to the water heater befoire installation that will greatly extend the life of the water heater.  their main claim is that a good quality heavy duty sacrificial anode will make a 6 year warrenty  heter perform as well as a 12 year warrenty heater.   what are your thoughts on their claims about the sacrifical anode?  do you now any plumbers who can verify these claims?  thank you.

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