I just changed hot sake about 2 months ago. It is selling well.
But I need to change again. The reason is simple. The original one ( Miyano Yuki) is out of stock for a while.
This new sake is called Tsukinowa, Moon ring. It comes from Iwate, northen area of Japan. I think Tsukinowa is better than Miyano Yuki. Th price is also higher but I get a good deal. I can get promotion price and can sell same price as Miyano Yuki.
Some sake doesn't need to heat up hot. It is OK sometimes warm temperature. Koji, Sake Master told me make warm this sake. And another reason is simple. If you heat it hot, alcohol is gone. You just drink sake without alcohol.