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does not pulse it seems that the hammering is in the tank, only occurs when water is flowing.

noise was there before I cleaned the tank. Expansion tank was replaced, brought at Home Depot it's set at factory.

yes

No

The house is a one story slab on grade 21 yrs old. Water heater is electric, I cleaned, flushed,replaced anode, expansion tank, elements and sucked up the sludge in the bottom of the tank. Heating elements are side mounted through tank at approx. 1' above bottom of tank the second set about 2'...