DEMMEX 2017 Hammered Copper Tea Pot Kettle Stovetop Teapot, 1.6-Quart (Antique Copper)

How do you clean the cooper, and does it need frequent cleaning?

Electric stove has burners of various sizes. May I place kettle on larger burner to boil quicker?

How long does water take to boil in this kettle?

Does this teapot have a warranty? I have had it a little less than a year and it the beautiful brown finish has grayed and is rubbing off.