I have used this tea pot for many years now. The company that sells this claims:
The most convenient teapot you will find anywhere - we guarantee it. When tea is ready, simply place it atop your cup. This will cause a valve at the bottom to release: crystal-clear tea flows down, while the mesh filter retains all the leaves with one of the best infusers on the market. Super easy to clean and dishwasher safe. And it's microwaveable - perfect for the office or the road. You will wonder how you got along without one. Made in Taiwan of food-grade plastic.
I use an eltric kettle to heat the water for steeping my tea and just pour it right over the tea inside the tea pot shown above.