For loose-leaf tea the Nordic Kitchen cafetiere from Eva Solo has both a unique valve system that gives you control over the strength of your tea, and a double-walled design to keep the tea hotter for longer.
It follows the same brewing process as for coffee, so you can choose how long you want to brew your tea. The plunger filters the tea leaves, separating them from the water, so simply press it down when the brewing time is up.
The plunger is dishwasher-safe but the jug must be washed by hand. Regularly oil the wooden handle to keep it in good condition.