In Korea, Bori Cha is served hot in winter, like a plain hot tea without milk or sugar, and cold in summer. I remember being served this hot beverage in many stores while in Korea in wintertime. There would be a kerosene stove in the back with a tea kettle on top. The storekeeper would just pour some in a little cup and offer it to anyone who came by. It was really nice! Kind of comforting and cosy, and definitely encouraged me to step inside the little store and stay there and check things out while drinking the tea. Not a bad investment on the part of the storekeepers I reckoned!
Seems like hot Mugicha has become more popular in Japan too since the Japanese have added hot Mugicha in cans to their vending machine offerings. That's quite a strange thing, vending machines that sell cans of hot drinks! I suppose its more hygienic than the American cups that get different liquids poured into them that we have in convenience stores. Also, the Japanese machines are outside, so using the cups wouldn't be entirely convenient! In any case, I've had other kinds of tea in cans, not bad, so I suppose the hot Mugicha would work too.