Problem is that its only connected to one pump with some underground pipes but boilers are not fed. But water is heated. See screenshot and savegame.

savegame
https://www.dropbox.com/s/qax5li1l04ehm ... %20bug.zip
only 99% sure. I will try it again. Destroy all set up and built it again. I hope it will confirm or reject my issue.kovarex wrote:I opened the save ... I don't know when I pumped the water out, it didn't heat again, are you sure you didn't connect it with the hot water for some moment and disconnected again after that?