The Calciner's description in factoriopedia just says "Consumes fluid" and leaves it at that, though it looks like not every fluid is valid for fuel. (e.g. Steam, Lubricant, Coconut oil, etc.). It'd be super if you could add which fluids are accepted, similar to how entities like the Boiler show they accept water.

Calciner should accept any fluid with a
"Fuel Value,"
because those are the only fluids the game accepts as liquid fuel.
I can't list every fluid possible because it's based on property not on fluid.
It's a property, and you can check it in the wiki by clicking, for example, on crude oil.

Methane, coconut oil, and ethanol have this property added.

A higher fuel value means that the Calciner will consume less of that fluid to burn things.

By default, the game only shows that it "Consumes Fluid" with a value in MW, which suggests that the fluid has an energy value (can be burned).
I agree that it should be mentioned somewhere. I am still working on tips, tricks, and descriptions for mechanics and new features.

I found out that some of fuel values are added by maraxsis and i was using those as a baseline. I will add fix today, so everything will work properly without maraxsis installed.

just released version with calciner info in factoriopedia and fixed missing Fuel Value properties