Does it stay hot for a long time, or cool down quickly?
It's honest to say this isn't an insulated mug: it's single-wall stoneware ceramic, not double-wall or vacuum construction, so heat retention is modest. With the lid on it holds tea warm long enough to finish a cup unhurried, but it cools faster than you might like, especially next to a vacuum travel mug.
Is there a warranty on this mug?
ZENS doesn't list specific warranty terms for this mug beyond the usual product details. What you can count on is straightforward: care for it the way you would any handmade ceramic piece, wash it by hand, and handle it gently, since that's what determines how long the glaze and handle last.
Can I put it in the dishwasher?
No. ZENS specifies hand washing for the mug itself, since the hand-sprayed glaze and the wood handle hold up better with hand care. The metal strainer insert alone is dishwasher safe.
What kind of wood is the handle made from?
ZENS doesn't name a specific wood species for the handle, only that it's wood, shaped and angled for a comfortable, secure grip with a thumb rest.
Is the infuser mesh fine enough for loose-leaf tea, or will small leaves escape?
Yes: the fine mesh handles loose leaf tea well, and the infuser's extra depth compared with a typical metal ball gives leaves more room to expand for a fuller-tasting cup.
How durable is the ceramic, will it chip or crack easily?
The ceramic is solid and well made for daily use, but the weak point is the handle, which can snap off at the joint if the mug is dropped, so how it's washed and handled day to day makes the biggest difference.