Onboard water

The answer is yes and I have such a system on my Knaus which was retrofitted by the dealer since, surprisingly for a twin axle van, there was no inboard tank.

The tank has a float switch which operates the Aquaroll pump via a small electronic switch.  When the inboard tank is empty - or the level falls below the float switch, the aquaroll pump comes on and keeps the inboard tank full.  All the water in our van comes from the inboard tank.  

An alternative way - as we had on our previous Barcelona - is to have a three way switch - off / inboard/ outboard pumps - but this meant having to go under a seat to switch a valve over to divert the water from the aquaroll to the inboard tank.

Are you absolutely sure there is no way of filling the inboard tank other than by the means you describe - since that's most unusual?

 

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I have done similar to David and use a spare submersible pump we had from our previous caravan.  I fitted it with a push button on/off switch and a cable that plugs into an external 12v socket I fitted in a locker nearby.

I use it to fill the toilet header tank as my arm does not like lifting  the water carrier.

We also have an onboard water tank, but that already has a pump and valves that we can set either to use water from the tank, from the aquaroll, or fill the onboard tank from the aquaroll using a pipe that plugs into a water inlet in the side of the van.

My caravan came with an additional pump just as you describe .... the socket for it is just inside the toilet cassette door. 🙂

Yes, I saw it on an older up-market Swift and decided to make my own version as I had a spare old pump. Useful when the arm does not work so well.

Thank you all! Submersible pump it is then. 

…..and a 12v connection.