I also want to get a WW. I already have one in my eye. A Knaus Bj. 77. The problem is that the heating does not work. The previous owner told me that the one was stuck off because it would not be allowed anymore. Is that allowed? Isn’t there a constancy protection? Or does he screw me because the part is broken. New Truma heating surrounds are already available at ebay from 250€. Can you change them yourself? Does the gas decrease have to be changed? Or maybe one of you still has a are you lying?