Headquartered in Nagoya, Rinnai has 20 branches and 86 sales offices in Japan in addition to six domestic production facilities. The Corporation maintains an international presence through 13 subsidiaries and affiliates in Australia, Brazil, Hong Kong, Indonesia, Malaysia, New Zealand, the People's Republic of China (PRC), Singapore, South Korea, Taiwan, Thailand, the United Kingdom and the United States.
Japan Ceramics Co., Ltd.
RB Controls Co., Ltd.| 2003 | Received ISO 14001 certification for all domestic factories. |
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| 2001 | Received Technology Prize from Japan Gas Association for its highly efficient condensing-type gas hot-water appliances. |
| 2000 | Received Ministry of International Trade and Industrys Energy Conservation Award for its highly efficient condensing-type gas hot-water appliances. Received ISO 14001 certification for Seto Factory. |
| 1999 | Established RG Co., Ltd. |
| 1998 | Established Rinnai Vietnam Co., Ltd. Established Rinnai Hong Kong Ltd. |
| 1997 | Received ISO 14001 certification for Oguchi Factory and Technology Development Center. |
| 1996 | Received Testing Facility Acceptance from International Approval Services. (IAS) Established Rinnai Holdings (Pacific) Pte. Ltd. in Singapore |
| 1995 | Received ISO 9001 certification for all domestic factories. |
| 1994 | New head office building completed |
| 1993 | Established Shanghai Rinnai Co., Ltd. |
| 1991 | Established Rinnai Singapore Co., Ltd. |
| 1990 | Established Rinnai (Thailand) Co., Ltd. Commissioned Tskuba Technology Laboratory. |
| 1988 | Established P.T. Rinnai Indonesia. Opened Hong Kong representative office. |
| 1986 | Received the excellent Technology from the Japan Gas Association as well as the first Chunichi Industrial Technology Award for the development of an ultra-compact hot-water heating unit. |
| 1984 | Received Ota Prize from the Japan Gas Association for development of a hot-water heating unit equipped with a safety mechanism to prevent incomplete combustion. |
| 1983 | Listed on the first sections of the Tokyo and Nagoya stock exchange. |
| 1982 | Listed on the Second Section of the Tokyo Stock Exchange. |
| 1981 | Established Japan Ceramics Co., Ltd. |
| 1979 | Listed on the Second Section of the Nagoya Stock Exchange. Established Rinnai Precision Co., and Seto Factory. |
| 1977 | Established Rinnai New Zealand Ltd. |
| 1976 | Established Rinnai Industries (UK), Ltd. |
| 1975 | Established Equipamentos NGK-Rinnai Ltda, in Brazil. |
| 1974 | Established Rinnai America Corporation Established Rinnai Korea Corporation |
| 1973 | Established Rinnai Malaysia Sdn. Bhd. |
| 1972 | Received Ota Award from the Japan Gas Association for a gas high-speed cooking convection. |
| 1971 | Established RB Controls Co., Ltd., and Rinnai Australia Pty., Ltd. Changed name to Rinnai Corporation. |
| 1970 | Established Rinnai Taiwan Corporation. |
| 1967 | Established the Technical Center. |
| 1964 | Established Oguchi Factory. |
| 1960 | Established Asahi Factory. |
| 1958 | Formed a technological tie-up with then-West German Schwank GmbH, and began production of infrared gas burners. Applied new technology to the development of room heaters and gas burners. |
| 1955 | Established Aichi Factory. |
| 1950 | Reorganized as a limited company. Renamed Rinnai Mfg. Co., Ltd. |
| 1923 | Began supply of gas appliances, including tabletop stoves, ranges, ovens and water heating units, to public gas companies in Japan. |
| 1920 | Established as Rinnai & Co. |