Great, it resolved itself ... [problems that do that, have a tendency to also reemerge by themselves] a few notes:
What you describe is not vanilla behaviour:
- there only exist 165° (burner boilers) and 500° (heat exchangers) steam
- if you mix them, you can achive any temperature between that
- unlike with coal liquefaction only 165° boiler steam should work for this mods recipe
I guess you have another mod installed that allows heating of water like pre v15.10
That water would only counts as steam over a given threshold temperature.