How much HP washing is helpful for a hero?

Heroes don't really need to Wash in my opinion. If you were a DrK it would be more helpful.

smackyurself pls

hp wash as much as you can
if you can take an anego slap then youre good.

i hp washed until i could take an anego hit but i got too addicted so now my current hp base is at 21k at lvl 179