What should I look for when buying a teapot?
Also know, what material is best for a teapot?
All three are great options for a teapot with pros and cons. Ceramic is sturdy and good for retaining tea but can be heavy. Porcelain is light and delicate but can be too dainty. Glass is perfect for herbal tea but doesn't do well with retaining heat.
Also asked, what teapots keep tea hotter?
Since black and puerhs teas are brewed at higher temperatures than other types of teas, using ceramic teapots will ensure no temperature loss and will allow the liquor inside of the pot to keep warm for longer time. Porcelain teapots are adequate for making white and green teas.
No, a teapot is not necessary. If you break it down all you need is hot water, some leaves, and a way to get the leaves out of the hot water. Most teapots and tea equipment are made to make this process a bit easier.