The plumber moved the (gray) water tank to it's final location. At my request, he also installed a water filter, the small object suspended between the tanks, The water arrives from the well (light blue arrows), is stored and pressurized in the gray tank. Cold water is then fed thru the filter and to the house along the dark blue arrows. Cold water is also fed to the (blue) hot water heating tank. Hot water is fed to the house out the top of the hot water tank (red arrow). The pink arrows show the pipes to/from the boiler that are used to heat the water in the hot water tank.