Ok, thanks, maybe I just did not understand, how it works. It confused me, that the water temperature in the boilers was still 15 degrees. I am at school right now, so after I get home I will try this.

I just instaled the new version and tested it. I created a new world on that version, so it is more likely that everything will work fine. After a while, I build a boiler aand found a bug, where this boiler did not produce any heat, so the water was still on 15 degrees, although the coals, I put in ...