To save the water in the 130L on board tank for drinking and kitchen use, an external connection pumps water from a jerry can or bucket directly into the heater. When operating on 240v (generator) the water is heated continuously for luxuriously long showers. When you're out of water, simply take the jerry can to the nearest water source and refill. The on board water can be saved for drinking and cooking while the shower water can be from undrinkable sources such as creeks. This solution is far more practical than having a second tank as even with a 60L tank (only the equivalent of three jerry cans) once it is empty there are no more showers until it is refilled which is not always possible.
An added benefit of pumping water directly from an external source is that you can easily monitor water usage. This feature is especially useful with children as it is so easy to go through 20L in one shower without realizing it. Also, when adjusting the flick mixer to get the required water temperature, the unused water can be directed back into the jerry can, again saving water. Campers to late 2011.
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