Case Study: Metos Co., Ltd. Installs Saunas at "Mainichi Sauna Tokyo Makuhari Store"

Metos Co., Ltd. (Headquarters: Chuo-ku, Tokyo; Representative Director: Shoichiro Yoshinaga; hereinafter "Metos"), which operates hot spring/sauna, fireplace/wood stove, and welfare businesses under the motto "warming people's hearts and bodies," has delivered sauna equipment, including the "Pro iki" which is making its debut in Japan, to a total of four rooms at "Mainichi Sauna Tokyo Makuhari Store" (hereinafter "Mainichi Sauna Tokyo"), which opened on May 8, 2026.

World-renowned premium heater IKI upgraded and landed in Japan for the first time

- "Pro iki" features a lower design compared to conventional IKI heaters, allowing for greater freedom in sauna room layout. - The maximum capacity of sauna stones, the greatest appeal of IKI heaters, has increased by approximately 20% compared to conventional models. The IKI heaters installed in this facility generate profound radiant heat and high-quality löyly from over 300 kg of sauna stones. Air convection efficiency has also improved, increasing the satisfaction of IKI sauna fans.

"Pro iki" Sauna Heater

Mainichi Sauna Tokyo offers unique saunas

- Metos delivered four unique sauna rooms. A distinctive feature is the ability to experience saunas with different temperature ranges and different heat sources, such as electric and gas, within the same facility. Equipment proposals were made to allow users to change their sauna style depending on their physical condition, mood, time of day, and other usage situations.

Kero Joki Ranbu

- This is a sauna room that can comfortably accommodate over 20 people, a highlight of Mainichi Sauna Tokyo. The interior is meticulously designed, using Finnish Kelo wood. In the Kelo sauna, equipped with the Japan-first "Pro iki" heater, both auto-löyly and self-löyly are possible.

Kero Joki Ranbu Interior

Herbal Cabinet Steam Bath

- This modern interpretation of a traditional Edo-period cabinet bath allows users to immerse their lower body in a tub filled with water up to their knees, while their upper body is warmed by steam. - It's a medium-temperature, slow-style sauna where you can enjoy both steam bathing and a half-body bath with medicated water, while being soothed by the aroma of herbal water and steam.

Herbal Cabinet Steam Bath Interior

Meditation Magma Steam

- This is a steam sauna where you can immerse yourself in your own world while being enveloped in soft, soft-water steam. Each seat is partitioned, and in the dimly lit room, you can bathe at your own pace without worrying about your surroundings. - Since each seat is equipped with a shower, you can also enjoy bathing while showering with water, making it a sauna enjoyable even for those who dislike hot, dry spaces.

Meditation Magma Steam Interior

Reiwa Far Infrared

- This is a far-infrared sauna that can efficiently promote sweating even in the medium temperature range of 70-80°C. - Constant humidification softens the tingling sensation characteristic of gas saunas on the skin. - This is a sauna room with a TV, which has developed as a unique Japanese culture.

Reiwa Far Infrared Interior

Cold Bath, Hot Bath, and Relaxation Area

- Three types of cold baths are available, offering not only different temperatures but also different water qualities and depths. There are also three large hot tubs, where you can relax with highly concentrated carbonated springs and jet baths. The relaxation area provides approximately 70 seats, including chairs and beds, and a drink counter is also attached. - Mainichi Sauna Tokyo is particular about water quality, using smooth soft water that is gentle on the skin. - The facility features various touches that continue to captivate sauna lovers even after their sauna session, such as relaxation spaces designed to evoke European hot spring facilities.

About "Mainichi Sauna Tokyo Makuhari Store"

- "Mainichi Sauna Tokyo" is a next-generation sauna brand born from the fusion of "Sauna Tokyo," which boasts overwhelming popularity with its diverse saunas and cold baths offering different temperatures and water qualities, and "Mainichi Sauna," which aims to be an everyday home sauna. As its first store, "Mainichi Sauna Tokyo Makuhari Store" opened on May 8, 2026.

(From top left) Mainichi Sauna Tokyo Exterior, 2nd Floor Sauna Area, Relaxation Space, 1st Floor Bath Area

About Metos' Hot Spring and Sauna Business

- Metos began constructing and selling saunas early on, in collaboration with overseas partner companies, triggered by the creation of saunas in the Athletes' Village for the 1964 Tokyo Olympics. - We provide integrated services from equipment diagnosis, equipment design, construction, to maintenance. - From an early stage, we have also focused on business development that considers SDGs and the environment, and as professionals involved in "housing" within "clothing, food, and housing," we propose comprehensive hot spring businesses that can contribute to the realization of a sustainable future for people. - In addition to its hot spring and sauna business, Metos also handles fireplaces and wood stoves, such as wood stoves, gas objects, and custom fireplaces.