Raised a github issue about it, but the boiler fluid calculation does not work for any mod that screws with the heat_capacity of water.
The getPowerExtract function takes heat_capac, but the calculations inside look at heat_capacity, meaning it falls into the nil or 0 case and forces it to 200. This affects the pyanodon AE beta at least, and might be related to the Krastorio issue the comments in the code further down talk about
