Mine was leaking too, but I think it was mostly caused by me removing the back of the heater and not applying any new lute/clay/cement(what is the correct english for "Kit" anyway).
It the previous email is correct about the airpressure... my machine had collected quite some dust at the back of the heater compartment, which could easily have cluttered the water pipe collecting the wather around there.
Ruud Schramp
November 2005