Question 1: Can this pot be put directly on a burner?
Question 2: Was wondering what TYPE of Stainless Steel? Is it food grade (304, 430, 220, etc.)?
A: TAOindustry French Press is is 18/10 stainless steel, which also equates to type 304, which is 18% chromium and 10% nickel. It is a common food preparation grade stainless steel and is of a higher quality than the more common 18/8 grade. http://en.wikipedia.org/wiki/Stainless_steel
Question 3: How many ounces of coffee can you make in one pressing? It claims to hold a liter.
A: It depends on how you like your coffee and what your grounds are like. I grind my coffer fairly fine(too fine and it gets a chalky consistency). You can get 4 cups of 8oz OR 2 cups of 16oz
Question 4: How long does the coffee stay hot?
A: 45 minutes to 1 hour the coffee stays warm hot. If you can finish couple cups for 30 minutes, you should be OK.
Question 5: How to change the filters
A: The bottom portion, below the screens, unscrews off for replacement. You need to get a good grip either at plunger shaft or the top of that shaft. grab the sides of the screen frame and just turn counter clockwise.
Question: When you press down the plunger, does it scratch the wall and produce fine steel powder into the coffee?
A: I have mine for several months now and have never noticed fine steel powder. Stainless steel is hard and durable. We use course ground coffee and never had a problem.