The clay kettle, there,s something to be said about these kettle,s. Not only do they heat the water but they change the waters character. Water boiled in a clay kettle is different than water boiled in any other way. The water becomes alive, teeming with thousands of little tiny bubbles. I think a good word to use here would be "effervescing" this does make a difference in the taste of the tea. If I,m really in the mood for a really good Oolong or going to have a Puerh throw down I almost always use this kettle. As much as I love my Zojirushi I have to admit that compared to the water heated in this the Zoe,s water tastes flat and lifeless.
Ive read, and believe to be true that clay kettles can add extra minerals to the water. So if your using water that is moderate to high in mineral content I wouldn't use a clay kettle for say...Sencha. With some teas you want to keep the mineral content as low as possible. But for Wuyi Oolongs and Puerhs it can add a little extra pizazz to your pot. Of course being made of clay some care must be taken. After use don't put the lid back on until it,s dry on the inside (overnight) or it can develop an odd odor. Don't refill with cold water when the kettles still hot or it can crack. You know just common sense kinda stuff. Not something I use on a daily basis but for those special teas and or when you can spend quality time enjoying your teas these kettles are fun.