Water Supply Plumbing

This part of the plumbing is actually a bit complicated. There is a lot more going on than one might think. At the top of this picture we have the inlet, including gravity tank fill hose (large), the hose line (white pex along the top), and the tank vent (clear tube).

The black tank on the right is a pressure tank which evens out the water pressure, especially for when the tank/pump is used.The water goes into the tank from the tee to its right, collecting water from the pump (below) or hose supply (above). From the tank, the water connects to the main cold water line to the tiny house and tees out to the water heater on the left. Hot water from the water heater goes to the main hot water line to the house. The connections to the water heater are female swivel adapters that are easily removed for draining the water heater for winter. While the plumbing inside the walls is all copper, pex, sharkbite fittings, and barbed fittings are used here. The gravity fill uses some PVC, copper and clear tubing. The clear tube that runs down the side of the tank is a sight tube so that you can tell how much water is in the tank.

The yellow hose is the gas line. The wiring is 12 volts for the water heater and the pump.

This picture shows the tank, drains, and supply line to the pump. The copper coming out of the bottom of the tank has two purposes. It serves to drain the tank through the appropriate valves down a hole in the floor. And it supplies water to the pump, upper right, through the RV supply line. A flexible hose helps eliminate pump vibrations that can reverberate through the entire house. This one is a special RV hose rated for potable water.

Not sure how visible it is, but in the back at the bottom of the wall are valve to drain the hot and cold water lines. All the water lines in the tiny house slope down to this point so now water is completely drained.

Although not part of the water supply as the title would suggest, I should note here the tub drain in the floor. You can't quite see it here, but it and the rest of the tub/shower plumbing are accessible here,  just beneath the pump.