thermal fluids don't exist in 1.15.2+ yet as of writing.

if you googled for this issue, update your version or add them in the config, its probably supported in the latest version if the thermal fluids exist

biggerreactors-1.18.2-0.6.0-beta.1.1 Thermal fluid wont work. I understand it is in beta.

Thermal 1.19.2 added fluids back, next 1.19.2 version will have support

added back in 1.19.2-0.6.0-beta.6

moderators were moved out of the config file into the datapack, sooo, get a new version, if this issue is closed then its fixed.