Tea made properly must steep in its hot water for a period of time- depending on the strength one wishes their tea to be. Personally, I like a strong tea as I take mine sweet and milky.
While the tea is brewing, some of the heat is lost. If desiring the tea to be hot for pouring, a tea cozy is commonly used to insulate the tea pot. This can be knitted or quilted and looks to be a sort of “hat” or “bag” for the tea pot.
I have found the perfect cozy for Miss Marple- as she is always busy with her knitting and has beautiful china blue eyes (Joan Hickson).
Living Miss Marple 