The infirmary lets you revive 70% of your fallen units for drachmas. If you get temple of demeter on level 21, then you can revive 75% of your units.

I don`t have level 21 yet but that`s what i figured out from the description :/ somebody do correct me if i am wrong though.

i had now 75 % on revive  units ..but thought i had it because i  had infirmary at level 14 ..and anyhow didn't checked so much those procentages  in the past ... and didn't remembered what i had initialy...In the bonus info it's saying something about the healer ...and there it's  not an procetange available...it's confusing ...  Thanks for the info 

The Healer in market is just a copy of your infirmary. and i think those wheel of fortune discounts for unit revival are done over the healer, that`s the only difference i think.