This is a very broad question so I will give a very broad answer.
Build enough steam generators to cover your consumption 10 steam engines need 13.1 boilers to power them. And pipes can only supply a limited amount of water o build in modular sections of 10 steam engines and 13-14 boilers per offshore pump
Hover over the steam engine and look at the two bars:
If the second bar is not full, then you need either more or hotter water (more pumps, pipes or boilers).
If the first bar is less than the second bar: You have enough energy and the production is fully sufficient.