I'm in the new house which has well water (softener and carbon filtered) and a propane gas cooking stove. A few weeks ago I started using the humidifier 24/7 as our humidity was dipping below 40%. After the humidifier was on a day we noticed the gas stove flame was no longer blue but orange. After much investigation (and initial CO worries) it turns out it's the minerals in our well water that is causing the orange flame. Who knew? So we now run the humidifier over night and keep it off during the day. A balmy 26o this morning on the Eastern Shore.