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.
|1920||The company is incorporated as Rinnai & Co. by founders Hidejiro Naito and Kanekichi Hayashi.|
|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.|