According to practitioners, Japanese water therapy must be done for different periods to treat different conditions. Here are some examples: The savings in terms energy are indeed immense, and comfort is indeed higher than heating the whole room when I just sit behind the desk.

Heating on full power for 5 minutes works perfectly. Just make sure that the bottle can freely rotate in the oven and heat up evenly. Creator and author of "No Tech Magazine". Short posts related to the same topics. In English. (Since 2009). The use of metal and ceramic hand warmers has a long tradition in China and Japan. The Japanese offered guests a small roundish ceramic pot with fuel inside, called a “te-aburi”. Copper or bronze box-shaped hand warmers a few inches across, often with perforations and carrying handles, were called “shou lu” in China. Image in the public domain. Read more: https://homethingspast.com/2011/11/26/hand-warmers-muff-warmer/ Cold water bottles Keep surfaces warm, or at least not cold. People used to put think tablecloths on tables so that they wouldn’t feel cold to the touch. Water intoxication, or overhydration, can occur when you drink an excessive amount of water in a short period of time. It’s caused by hyponatremia — or low salt levels — in your blood due to salt being diluted by excessive fluid ( 9).A foment can is filled with hot water and used very much like a hot-water bottle to apply warmth to the body. Fomentation actually means “to apply warm liquids to treat the skin.” This oval-shaped can is curved to fit the body. Maker: Kenworthy Son and Company. Place made: Southport, Sefton, Merseyside, England, United Kingdom. Source: Science Museum, London. (CC BY 4.0). https://wellcomecollection.org/works/gf42542b Insulated Water Bottle,Water Bottle Personalized,Water Bottle Name,Thermos Bottle,Bridesmaid Gift,Drink Bottles,Party Favor,Girls Trip Gift

Imagine that four household members each use two hot water bottles simultaneously and reheat them every two hours throughout their waking hours (16 hours). Total energy use is then below 4 kilowatt-hours, almost 30 times less than the heating energy consumed by the average Belgian household. This is one of the most well-liked Japanese brand water bottle series. Interestingly, though, Zojirushi refers to its products as “mugs" and not “bottles.”

You can go one more step further and put a large blanket over the desk or table and then put your legs underneath it. Such heating arrangements have been used in different parts of the world, usually with hot coals as the heat storage medium. Examples are the Japanese “kotatsu”, the Middle-Eastern “korsi”, and the Spanish “brasero de picon”. The first two are rather low to the ground – people sit on the floor – while the latter fits the common seat height in the Western world. It’s easy to build such a heating arrangement – and a few hot water bottles are the ultimate heat source for it. Hot water bottles outdoors & on the move