The reason for the change is that the super clean destroys aluminum, and is pretty harsh stuff in general. Peeled the paint from the inside of the parts washer. I could try and find another water based degreaser but most of them suck. The PSC-1000 is aluminum safe and not as harsh on other metals and coatings, but it isn't recommended for rubber and plastic. That's why I'm wondering about the insta-hot water heater. Keep the temp at about 100* and it should be fine, and not evaporate too quickly