Onsen or Sento?

Modern ones look especially similar to each other

Onsen means Japanese hot spring,
while sento means Japanese communal bath

Onsen is available in public and private,
while sento is only available in public
unless you happen to be the only ones around

Water from the onsen possesses
therapeutic health benefits
from its mineral content,
while sento contains just heated boiled tap water

Onsen-looking baths in most westernised chain hotels in Japan are sento

Public or Private button