Join Date: Feb 2007
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I have the same van and wter system as you.
We also had a leak this year it was the pressure valve which is on the outside under the plastic cowl at the top left on the heater.
This is a common fault im told, the plastic valve weakens over time and cracks causing leaks.
This valve changed its name from a pressure relief valve to a quick release or drain valve, because under pressure the tank itself would pop off before the valve would open thus making it useless.
So as its not really needed as a safty thing, you can try like I did ( and its still working fine) twist off the valve until it breaks off scary but its already bust so nothing to loose.
Once snapped off you will have a hole with the remains of the valve (plastic) find a screw/bolt that fits into the hole quite tight to blank it off.
Be very careful when you do this not to use to bigger screw/bolt the metal cast of the heater is not very strong and you dont want to crack it.
If you want to try and get the broken thread out and put a new valve in (about £10) you can use a hacksaw blade to cut it into bits but be careful not to get bits in the tank or cut the thread.
Do not use a stud extractor to get the plastic out it will crack the case.
I called Gary at Arc systems really helpful the Tel is 01159213175, they do an exchange for £60 if all goes wrong.
I hope I havent waffled on and hope this helps.