What is a schematic? The schematic show's a tank, a pump, a holding tank ( hot water heater), accumulator and a valve. It will also show connections between each component. But the schematic will not show the line routing i.e. line drawing of piping/ tubing. In some industries this is not a requirement for manufacturing especially if PEX tubing is being used. I also think a schematic would be useless to most individuals as they would not understand the international symbol for most components that are used in a schematic drawing.
Do you have a wiring diagram and or a water line drawing for your main residents that you live in?
From a retired hydraulic engineer.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67