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Not sure sure what you mean by "..vent the ultra store"..as I've never heard that before..?

Are you sure it isn't just draining out through the(open)boiler drain tap/hose?

Our previous van was an '07 Compass Advantgaurde 120,so I assume a similar set up(...although I'm not sure what the "Rapid" is..?).

To "prime" our water system,it was just a case of shoving some water in the tank(..and it didn't need to be full)and then with the pump on,I just "bled" it through by *operating each tap in turn,until all the air had gone and the water ran smoothly(..even without any taps open,once the pump was on,I would hear the boiler filling up..).

(*Which order you operate the taps in may/can influence how easy/quick this operation is...)

Hope some of this helps..

I've no idea then, sorry...

Have you checked the Truma websites?

...have a look at the PDFs on here...they may say/show something...

http://dealer.truma.com/_anweisungen/Truma-Katalog/gb/boiler/ultrastore.html

(..although other than having the hot taps open,which I assume you've done/tried,I can't see it mention anything...).

But Clive reckons it's "syphoning"  out of a breather..not just draining from...well..a drain....

I'd like to assume that by now Clive would've checked drain valves?.........

(..having said that,our current van,with it temperature sensitive dump vale,caught us out when we first had it...)

Glad you got it sorted Clive...

Well "diagnosed" mjcreed...

(..and a piece of "knowledge" that is worth "storing",just in case...Thanks)