On Wed, 19 Aug 2009 15:29:18 -0700, Salmon Egg
wrote:

Does it make practical sense to preemptively replace anodes in working
water heaters in order to extend their lives? Is it better to just wait
until leaking begins?

Bill


I think water heater anodes are best left alone. But I do give the
tank an occasional 5-gallon flush. Supposedly a manufacturer
recommended an expansion tank to extend tank life.