I was hesitant to email "Optimus" because of a previous discussion about a problem with another stove, but I did it anyway, and I haven't received an answer yet. The discussion I was referring was that the customer rep from Katadyn Optimus haven't even read the users manual on that particular stove! There's no way he'd understand.
I received this stove less than two weeks ago and test drive it. The "ON" "OFF" feature on the pump doesn't work. I bent the tube away from the body and the "OFF" mark on the pump, yet it continues to roar. What else could be the problem?