Chinese tea shops often use little electric kettles (maybe two cups worth) that sit on a base, and are kept at a constant (adjustable) temperature, usually just

Chinese tea shops often use little electric kettles (maybe two cups worth) that sit on a base, and are kept at a constant (adjustable) temperature, usually just below boiling. The constant heating is good for lengthy tea sessions -- if you just want a cup or two you could probably just switch it off when it reaches the right temperature.