Most Demons are resistant to the heat and fire of Lava and choose to relax for awhile here after a long day. Some may choose even not to leave enjoying the relaxation from the heat and how the lava is actually good for them. Considering it's filled with natural minerals from the rocks around them
Though some of the Demons are not resistant to heat they have not been forgotten. Due to the terrain these hot springs are warmed by the Lava pools using an intricate series of tunnels carved under the mountains. After all even Demons need a vacation
