i think this is an issue that we need to ask for a fix on DyTech, the issue is that it replaces all water usage (including power production) with dirty water, so scripting the replacement to "clean-water" on the dytech side would fix it :(
If you are interested, you can manually "hack" fix the problem by changing the max temp in the scripts/diesel-gen.lua and the prototypes/oil-boiler.lua
I hope that helps alternatively, change it to the clean water entity and leave it at 100C (i did not do this one, sorry)