Nippon Thermostat Co., Ltd.

Nippon Thermostat Co., Ltd. (日本サーモスタット株式会社) is a Japanese manufacturer specialising in temperature-control and thermal-management products. Founded in May 1954 (Showa 29) and headquartered in Kiyose, Tokyo, the company describes itself as a "system creator" that contributes to the environment through optimal thermal management and supports a wide range of technologies. Its core business is the design and production of thermostats and related thermal components, with automotive thermostats as its flagship product line. The company's automotive portfolio includes thermostats with integrated thermo-elements, oil valves, water-temperature sensors and sports thermostats. Its products are used in four-wheeled vehicles, motorcycles, buggies, outboard motors, tractors and lawn mowers. Nippon Thermostat states that its thermostats enabled the "met-in scooter" (a scooter with an enclosed helmet storage compartment), and that its products have demonstrated high performance even in extreme environments such as the 24 Hours of Le Mans endurance race. For motorcycles, the company has achieved weight reduction, miniaturisation and parts-count reduction through modularisation. Beyond automotive applications, Nippon Thermostat applies its thermal technology to comfortable living spaces. Its housing-related products include indoor air-supply vents, hinge-type ventilation units, thermo-cartridges, thermal valves, automatic mixing valves, automatic anti-freeze valves, floor-heating controllers (including timer-equipped models) and bronze castings. The company also produces thermo-elements and other temperature-control equipment. As of the end of April 2026, Nippon Thermostat employed 781 people and had capital of 450 million yen. Its representative director and president is Yoshitaka Onishi (大西祥敬). The company operates its headquarters and main plant in Kiyose, Tokyo, a technical centre also in Kiyose, and additional plants in Shioya (Tochigi), Shiojiri (Nagano), Yorii (Saitama) and Gifu. Overseas, it has related companies in the United States (Nippon Thermostat of America Corporation, West Virginia), Vietnam (Nippon Thermostat Vietnam Co., Ltd., Ninh Binh Province) and India (Nippon Thermostat (India) Limited, Chennai). The company holds ISO 9001 and ISO 14001 certifications. Nippon Thermostat remains a privately held Japanese company. Its official website lists product information, company history, locations, ISO certifications and news updates, including community-support activities and notices regarding holidays and the COVID-19 pandemic.

Nippon Thermostat Co., Ltd. was founded in May 1954 (Showa 29) in Japan. From its base in Kiyose, Tokyo, the company grew into a specialist manufacturer of thermostats and thermal-control components. Its automotive thermostats, which incorporate thermo-elements, became its flagship product line, and the company expanded its product range to include oil valves, water-temperature sensors and sports thermostats. Over the decades, Nippon Thermostat developed thermal solutions for a wide variety of engine-driven applications. The company states that its thermostats made the "met-in scooter" possible, and that its products have proven their high performance in extreme environments such as the 24 Hours of Le Mans endurance race. For motorcycles, it achieved weight reduction, miniaturisation and parts-count reduction through modularisation. Beyond automotive uses, the company applied its thermal technology to housing and comfortable living spaces, developing products such as indoor air-supply vents, hinge-type ventilation units, thermo-cartridges, thermal valves, automatic mixing valves, automatic anti-freeze valves and floor-heating controllers. It also produces thermo-elements and bronze castings. To serve its markets, Nippon Thermostat established a network of domestic plants — in Kiyose (Tokyo), Shioya (Tochigi), Shiojiri (Nagano), Yorii (Saitama) and Gifu — and overseas related companies in the United States, Vietnam and India. In May 2024, the company began operation of a Technical Centre in Kiyose City, Tokyo. As of the end of April 2026, it employed 781 people and reported capital of 450 million yen, with Yoshitaka Onishi serving as Representative Director and President. The company holds ISO 9001 and ISO 14001 certifications and continues to operate as a privately held Japanese manufacturer.

• Company founded (Showa 29).

• Technical Centre began operation in Kiyose City, Tokyo.

• Employee count reported at 781.

A thermal-management specialist and "system creator" supplying temperature-control components for automotive, motorcycle, general-engine and housing applications, with performance proven in extreme environments such as the 24 Hours of Le Mans.

• Automotive thermostats

  Thermostats with integrated thermo-elements; the company's flagship product, available in various types.

• Oil valves

  Automotive oil valves.

• Water-temperature sensors

  Automotive water-temperature sensors.

• Sports thermostats

  Thermostats for sports applications.

• Indoor air-supply vents

  Housing-related indoor air-supply vents.

• Hinge-type ventilation units

  Housing-related ventilation units.

• Thermo-cartridges

  Housing-related thermo-cartridges.

• Thermal valves

  Housing-related thermal valves.

• Automatic mixing valves

  Housing-related automatic mixing valves.

• Automatic anti-freeze valves

  Housing-related automatic anti-freeze valves.

• Floor-heating controllers

  Floor-heating controllers, including timer-equipped models.

• Thermo-elements

  Thermo-elements for temperature control.

• Bronze castings

  Bronze castings.

1. 1日本サーモスタット株式会社ntcl.co.jp
2. 2会社概要 | 日本サーモスタット株式会社ntcl.co.jp
3. 3製品情報 | 日本サーモスタット株式会社ntcl.co.jp
4. 4ISO認証 | 日本サーモスタット株式会社ntcl.co.jp
5. 5Nippon Thermostat Co., Ltd. (Japan) - Wikidatawikidata.org