Hot water is the hottest water around.

Bottled waters have long been the rage in Japan, with store shelves lined with all kinds of flavors and levels of carbonation to appeal to increasingly health-conscious consumers. And on 1 November, Asahi Soft Drinks released yet another new take on an old classic with the only bottled hot water on the market.

▼ It’s called Oishii Mizu Tennensui Sayu.

This isn’t just any hot water though. It’s what is known as “sayu” in Japanese as opposed to “oyu” which is the normal term for hot water. Oyu is water that has been heated to a temperature of 40 degrees Celsius (104 degrees Fahrenheit) or so, whereas sayu is considered water that has been brought to a boil and then cooled to around 50 degrees Celsius (122 degrees Fahrenheit).

As you can probably imagine, the boiling process helps to remove impurities and thus makes sayu a healthier alternative to oyu, especially if you’re getting it from a tap. Sayu is said to be great for improving blood circulation and promoting healthy digestion.

In the case of Asahi’s Oishii Mizu Tennensui Sayu, natural spring water is directly bottled and then warmed to temperatures between 50 and 60 degrees Celsius (122 and 140 degrees Fahernheit)…which, come to think of it, doesn’t make this sayu. It really is just any hot water after all.

In fairness to Asahi, there isn’t a strict definition of what exactly “sayu” is and since the source is natural spring water served at the same temperature as sayu, there’s still a fair chance that the health benefits of this Oishii Mizu Tennensui Sayu hold true. Either way, customers in Japan have really been willing to take the plunge as sales have exceeded …continue reading