You need to check the manufacturer's recommendations for what type of water to use.
Rowenta brand, for example, states NOT to use distilled water/Reverse osmosis water, but tap or spring water (depending on your local water hardness).
Explanations range from temperature concerns, to the sensors needing some minerals to work right, to corrosion (distilled water is very corrosive over time).
As for scaling up, just like ANY tool, your iron needs maintenance, too. Check the instructions for how to clean it (usually, instructions say no soap, no wires brushes. I use a plastic abrasive pad and it works just fine.)
Death before Dishonor -- Nothing before Coffee
Nihil curo de ista tua stulta superstitione
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