removing block heater

hey guy
i want to put my turbo downpipe driver side and for this i need to remove my blockheater plug on my block. Im wondering if this plug conencts directly to water, then if so, i need to put a new tap to block this hole.

do i need to block it off if i remove that blockheater plug ?

found my answer,
yes, blockheater goes right trough coolant, so i need a plug to seal it