water system

The camper carries 40 gallons of fresh water, and 23 gallons of gray water from the sink.  These water tanks are located under the bunk and heated by return-airflow to the camper's water-to-air heat exchanger.  Nothing is exposed, or located underneath the camper's floor to freeze or get punctured.

A shot of the water tanks, as seen through the front left compartment door.  Fresh water on the bottom, gray water on the top.  Although from a plumbing standpoint it would have made more sense to mount the fresh on top and waste below it, the tanks were mounted in this configuration to keep the center of gravity as low as possible.  The corrugated hose is the fill hose, and the 1-1/2" to 3/4" transition and ball valve are for the gray water drain.

Water levels are monitored from the Mess area on this JRV panel near the sink base cabinet...

In the front right compartment behind storage space, you will find components of the potable water system.  In this image, you can see the water pump on the left, mounted to the wall.  The gray tank next to the water pump is the captive air tank to smooth out the pump's water delivery, and the orange tank is the water-to-water heat exchanger for making hot potable water.   

This marine-grade heat exchanger is of 22-liter capacity, manufactured in Sweden for Indel Marine of Italy.  It will produce almost 6 gallons of water in under one hour by just driving the Unimog!  Constructed of stainless steel and very well insulated, it loses about 1ºF per hour once the potable water is heated.  On my recent journey to RMM 2003, I was amazed to have plenty of hot water on Sunday morning, after shutting the camper off Friday night!

With the bed platform removed, a bird's-eye view reveals the expansion tank for the hydronic heating system.  (top right corner of photo below)  This tank is only functional when the camper is not mounted to the chassis.  Its purpose is to absorb expansion of the coolant as it is heated.  It also contains an air scoop and air bleed valve to help remove pockets of air from the heating system's coolant circuit.  All of these items are mounted inside a watertight curb on the camper floor.  Should any component or line leak, water or coolant will drain onto the ground without wetting the rest of the camper.  

Everything listed above is support equipment for a simple stainless steel double sink with Moen faucet...