Corporate History
Founded in 1920, Rinnai & Co. first manufactured and sold pressurized oil stoves. By the late 1920s it had already established itself as a trustworthy manufacturer of gas tabletop stoves, gas ovens, gas heaters, and gas hot-water units.
Corporate Development
| 1920 | The company is incorporated as Rinnai & Co. by founders Hidejiro Naito and Kanekichi Hayashi. |
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| 1923 | Deliveries of gas appliances, including tabletop stoves, ranges, gas ovens, and water heaters, to Japanese gas utilities nationwide, as well as exports, begin. |
| 1938 | Manufacturing of aircraft parts takes place with the factory coming under military supervision. |
| 1940 | The company changes its name to "Rinnai Aircraft Parts Manufacturing." |
| 1947 | Production of gas and kerosene appliances resumes at the rebuilt Head Office factory. |
| 1950 | The company is reorganized as a joint stock company and renamed Rinnai Seisakusho. |
| 1954 | The Tokyo Sales Office (now the Kanto Branch) opens. |
| 1956 | The Osaka Sales Office (now the Kansai Branch) opens. |
| 1957 | The Aichi Factory (now the Chubu Branch) opens. The company forms a technology tie-up with German company Schwank GmbH to manufacture and sell gas infrared burners and to develop heaters and cooking appliances that use them. |
| 1960 | The lnba Factory (later the Asahi Factory) opens. |
| 1961 | The Fukuoka Sales Office (now the Kyushu Branch) opens. |
| 1963 | The Sendai Satelite Office (now the Tohoku Branch) and the Sapporo Satelite Office (now the Hokkaido Sales Office) open. |
| 1964 | The Oguchi Factory opens. |
| 1967 | The Technology Development Center opens. |
| 1968 | The Niigata Satelite Office (now the Niigata Sales Office) opens. |
| 1969 | The Nagoya Sales Office (now the Chubu Branch) opens. |
| 1970 | Rinnai Taiwan Corporation is established. Business partnership with Yanagisawa Manufacturing Co., Ltd. Investment in Yamauchi Yoko (now RT Engineering Co., Ltd.) |
| 1971 | The name changes to Rinnai Corporation. RB Controls Co., Ltd., and Rinnai Australia Pty. Ltd. are established. |
| 1972 | The company receives the Ota Award from the Japan Gas Association for its gas high-speed convection oven. |
| 1973 | Rinnai (Malaysia) Sdn. Bhd. is established. |
| 1974 | Rinnai Korea Corporation and Rinnai America Corporation are established. |
| 1975 | Rinnai New Zealand Ltd. and Equipamentos NGK-Rinnai Ltda. are established. |
| 1976 | Rinnai Industries (UK), Ltd. is established. |
| 1979 | The company is listed on the Second Section of the Nagoya Stock Exchange. Rinnai Precision Co., Ltd. is established and the Seto Factory opens. |
| 1981 | Japan Ceramics Co., Ltd. is established. Business partnership with lsomura Kiki (now Rinnai Technica Co., Ltd.) |
| 1982 | The company is listed on the Second Section of the Tokyo Stock Exchange. |
| 1983 | The Hiroshima Satelite Office (now the Chugoku Sales Office) opens. The company is listed on the First Section of the Tokyo Stock Exchange and Nagoya Stock Exchange. |
| 1984 | The Takamatsu Satelite Office (now the Shikoku Sales Office) opens. |
| 1985 | The company receives the Ota Prize from Japan Gas Association for development of a water boiler equipped with a safety mechanism to prevent incomplete combustion. |
| 1986 | The company receives the Excellent Technology Prize from the Japan Gas Association as well as the first Chunichi Industrial Technology Award for the development of an ultracompact water heater. |
| 1988 | P.T. Rinnai Indonesia is established. The Hong Kong Representative Office opens. |
| 1990 | The Tsukuba Research Center (now Tsukuba Training Center) opens. Rinnai (Thailand) Co., Ltd. and Noto Tech Co., Ltd. are established. |
| 1991 | Rinnai Singapore Pte. Ltd. is established. |
| 1993 | Shanghai Rinnai Co., Ltd. is established. |
| 1994 | The new Headquarters building is completed. |
| 1995 | The company receives ISO 9001 certification for all domestic factories. |
| 1996 | Rinnai Holdings (Pacific) Pte Ltd. is established in Singapore. The company receives Testing Facility Acceptance from International Approval Services (IAS). |
| 1998 | Rinnai Hong Kong Ltd. and Rinnai Vietnam Co., Ltd. are established. |
| 1999 | Business partnership with Gastar Co., Ltd. RG Co., Ltd. is established. |
| 2000 | The company receives the Ministry of International Trade and Industry's Energy Conservation Award for its highly efficient condensing gas water heaters. |
| 2001 | The company receives the Technology Prize from the Japan Gas Association for its highly efficient condensing gas water heaters. |
| 2003 | The company receives ISO 14001 certification for all domestic factories. The company receives the Energy Conservation Grand Prize (Chairman's Prize) from the Energy Conservation Center for its glass-top stoves with inner flame burners. |
| 2004 | Guangzhou Rinnai Gas and Electric Appliance Co., Ltd. is established. |
| 2005 | The company receives the Technology Prize from the Japan Gas Association for its Eco-Jozu condensing dual water heater/space heaters. |
| 2006 | RBS Thermo Technology Co., Ltd. is established. The company receives the Technology Prize from the Japan Gas Association for its bathroom heater/dryer with mist sauna function. |
| 2008 | Rinnai Italia S.r.l. is established, and the Integrated Logistics Center opens. Rinnai gas tankless water heater receives the Super Nova Star Award (an energy-saving award) from the Alliance to Save Energy in the United States. |
| 2009 | Rinnai Canada Holdings Ltd. is established. |
| 2010 | The Production and Technology Development Center opens. |
| 2011 | The West Japan Customer Center opens. |
| 2013 | TheAkatsuki Factory opens. The Rinnai Parts Center opens following business integration. |
| 2014 | The company receives the Ministry of Economy, Trade and Industry's Energy Conservation Award for ECO ONE, a hybrid water heater with heating system. The company's hybrid water heater with heating system for Hokkaido receives the Kitaguni Energy Conservation and New Energy Grand Prize. |
| 2015 | Brivis Climate Systems Pty Ltd in Australia is acquired. The Dubai Representative Office opens. |
| 2016 | Gastar Co., Ltd. becomes a consolidated subsidiary. |
| 2018 | The East Japan Logistics Center (now Atsugi Logistics Center) opens. |
| 2019 | Our brand promise is established, and the Rinnai logo is updated. |
| 2021 | Industrias MASS SA de CV in Mexico is acquired. |