House Illustration (freshwater, sewage & heating)

This illustration is the final result of the last task in my course "Basics Interface" in the 2. semester at the University Of Applied Sciences Potsdam. Our task was to create a illustration of a complex happening of things without any word. It doesn't matter what, it just has to be complex enough.

I chose the connection of freshwater, sewage and heating in a house. It's just one of the many possibilities how this can work and it's strong simplified, but it's everything exact.
In fact that this is my first real illustration I made, I'm very happy of the result.