content: We purchased a Powerstar AE 115 Electric Tankless Water Heater, and while it worked fine for 4 years before the heat exchanger started leaking and caused it to short out BOSCH will not honor the 10 year warranty on the exchanger because it was defective. Why?Because instead of using two 40 amp breakers, the electrician used two higher amp fuse to ensure safety. What happened to the good old days when people stood behind their products? Now I am stuck with a worthless unit, and will have to shell out money I don't really have to get another one!! Yes I am bitter about it!! And it will not be replaced with a BOSCH product! Any Suggestions?