Is the expansion chamber still plastic?
I currently own a model SST-FLTR dispenser that has developed a leak. Although that model features a stainless steel main tank, the expansion chamber is plastic and is connected to the main tank by a piece of plastic tubing. As I'm sure you are aware, the plastic becomes brittle with age and exposure to heat, and it eventually cracks. In my case, the coupling on the expansion snapped off. In another example that is posted on YouTube, the tubing itself split.
With this background, my question is: has this problem been addressed by the redesigned HWT-F1000S? I am tempted to purchase one as a replacement, but I don't want risk the possibility of another leak. Alternatively, does InSinkErator produce a commercial-grade model that does not have plastic components?