User Manual BUNN HB Coffee Makers

Yes, you can buy paper filters. The basket is slightly taller than your standard basket filter so I would recommend buying the Bunn brand filters.
We have been using a gold mesh reusable filter, but it leaves the coffee sludgy. I will go back to paper.

I had the same problem... I discovered to start the "heating and brewing" process, it only takes a quick tap on the "brew" button. If you press down too long, then only the warming plate will heat up.

Yes, you just hold the brew button for five seconds and it keeps warming the coffee. Amazing! I is in the directions. We LOVE THIS POT!