First Expansion into Saitama: HARVIA Electric Heater "SPIRIT" Introduced in All 8 Buildings of "Earthboat Saitama Kawajima"

Musashino Sakae Kenzai Co., Ltd. (Headquarters: Chichibu City, Saitama Prefecture; Representative Director: Masaki Takahashi; hereinafter "Sakae Kenzai"), which operates the "Harvia Sauna Showroom Saitama Chichibu," announced the installation of eight "SPIRIT" electric sauna heaters from the Finnish sauna brand "HARVIA" in the trailer houses at "Earthboat Saitama Kawajima" (Location: Kawajima Town, Hiki-gun, Saitama Prefecture), an outdoor hotel with private saunas scheduled to open on April 3, 2026.

Earthboat is a brand that develops outdoor accommodation facilities nationwide under the concept of "Nature Escape." "Earthboat Saitama Kawajima" will be the brand's 10th location and its first expansion into Saitama Prefecture.

Sakae Kenzai will work to revitalize regional tourism and enhance the value of new stays by providing sauna equipment. Centered on world-class sauna facilities and reliable construction technology, we will promote projects that enhance the value of regional resources and contribute to the development of wellness culture and the future of the region.

About "Earthboat Saitama Kawajima"

"Earthboat Saitama Kawajima" was born as a glamping facility with private saunas in a rural area of Kawajima Town, Saitama Prefecture, about an hour from the city center. Each independent private area for each group includes a guest room with fluffy beds and water facilities, a sauna, a cold bath and an open-air bathing space, and an outdoor living area where guests can enjoy BBQ and bonfires. Each guest room at Earthboat, which is rented out as a whole building, is equipped with a private sauna, allowing guests to easily enjoy an authentic Finnish sauna experience.

Facility Name: Earthboat Saitama Kawajima

Location: 258-1 Obai Shinden, Kawajima Town, Hiki-gun, Saitama Prefecture

Access: 10 minutes by car from Kawajima IC on the Ken-O Expressway

Operation: Operation Company Inc.

Opening Date: April 3, 2026

Reservation Site: https://earthboat.jp/saitama_kawajima

Reasons for choosing Sakae Kenzai and HARVIA products

The decision to select Sakae Kenzai for "Earthboat Saitama Kawajima" was based on a comprehensive assessment of regional characteristics, quality, and operational efficiency.

Sakae Kenzai, with over 50 years of experience, was the first company to handle HARVIA products in Saitama Prefecture and operates the "Harvia Sauna Showroom Saitama Chichibu" as an authorized dealer. They have established a consistent support system from product understanding to design, construction, and after-sales service. Considering future maintenance and support for operating an accommodation facility in Saitama, it was decided to entrust the project to Sakae Kenzai, a local agent rooted in Saitama Prefecture.

HARVIA's global brand power, Nordic design, stable heating performance, and safety strongly resonate with the high-quality and sophisticated stay experience that Earthboat aims for. It was determined to be the optimal equipment as a symbolic presence.

Furthermore, the sauna rooms in the trailer houses have limited space, making it difficult to secure the necessary clearance for wood-burning stoves. Therefore, electric sauna heaters were adopted, considering operational stability and maintainability. HARVIA's "SPIRIT" was selected as the model to be introduced, as it supports single-phase power and has a compact size, making it easy to install.

About HARVIA Electric Sauna Heater "SPIRIT"

The "SPIRIT" electric sauna heater developed by HARVIA combines the beauty of Nordic design, high safety, and stable performance suitable for commercial facilities.

Its sophisticated form with organic curves gives the space a soft impression and enhances the overall texture of the sauna room. The abundant stone capacity provides enveloping heat and a stable löyly experience. It is a model that integrates design and practicality at a high level.

【Main Specifications】

Output: 6.0kW / 9.0kW (High-output design compatible with commercial facilities)

Compatible sauna room capacity: Approx. 5-14㎥

Stone capacity: Approx. 50kg

Installation method: Wall-mounted

Temperature control: Precise management by external controller

Safety design: Double-layer structure design to suppress surface temperature

"SPIRIT" is not just equipment; it is a symbolic presence that enhances the value of the space. Its stable performance and world-class quality support the high-quality wellness experience at "Earthboat Saitama Kawajima."

Comment from Masaki Takahashi, Representative Director and President of Musashino Sakae Kenzai Co., Ltd.

We are deeply honored that Harvia "SPIRIT" has been adopted for Earthboat's new project, "Earthboat Saitama Kawajima."

We value not just delivering equipment, but also sharing the values and philosophy that the space aims for, and giving shape to ideals. The stay experience at "Earthboat Saitama Kawajima," where guests face nature in the tranquility of the countryside. We are confident that HARVIA's reliable performance and sophisticated design have a high affinity with this worldview.

Sauna equipment is not "behind the scenes" but at the center of the experience. The stable heating performance and safety design of SPIRIT are extremely important for commercial operations.

As an authorized HARVIA dealer in Saitama Prefecture, we will consistently support the project from design and construction to after-sales service, contributing to the enhancement of this facility's value.

Earthboat Inc.

Earthboat Inc., which advocates "Nature Escape: Nature for everyone," operates "Earthboat," a trailer house-type accommodation facility with saunas, in partnership with local businesses. Through "Earthboat," a small boat drifting on the vast ocean of the earth, we will provide opportunities for many people to dive into nature.

Company Name: Earthboat Inc.

Representative: Gou Yoshihara

Established: September 2022

Location: 1856 Tomino, Shinano-machi, Kamiminochi-gun, Nagano 389-1312

Company Page: https://earthboat.jp/

Musashino Co., Ltd.

Musashino Sakae Kenzai Co., Ltd. has built rich experience and trust in the region over 50 years, primarily through its building materials sales business. Now, through "Harvia Sauna," we aim to provide healthy and comfortable living. We will continue to pursue sustainable development as a company while providing customer-oriented services.

Company Name: Musashino Sakae Kenzai Co., Ltd.

Representative: Masaki Takahashi

Established: July 1975

Location: 567 Ohnohara, Chichibu City, Saitama 368-0005

Company Page: https://sakae-kenzai.com/harvia/

Contact for this matter

Musashino Co., Ltd. Building Materials Division Sakae Kenzai Contact: Harashima

TEL: 0494-22-5556 Email: ksk-y@ps.ksky.ne.jp

As an authorized HARVIA dealer, we provide consistent support from showroom operation to design, construction, and maintenance.