Rinnai Corp (Rinnai) is a company that specializes in the development and manufacturing of heating appliances, kitchen appliances, and commercial appliances. The company focuses on creating products that enhance energy efficiency, safety, and comfort. Rinnai serves various industries including residential, commercial, and professional sectors. Rinnai's product portfolio includes high-efficiency condensing gas water heaters, hybrid water heaters with heating systems, tabletop stove burners with built-in safety sensors, built-in hobs, tabletop cookers, dishwashers, ovens, rice cookers, and range hoods.

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Rinnai focuses its R&D initiatives on developing products, services, and technologies that enhance daily life while promoting a sustainable global environment. The company emphasizes home appliances, utilizing combustion, heat transfer, fluid, IoT, and electronic control technologies. Rinnai Corp is also advancing in areas like hydrogen combustion equipment and electrification-compatible equipment to support a low-carbon society. The company is committed to creating products that suit local lifestyles for the overseas market and is fostering global human resources and strengthening cooperation with overseas subsidiaries. The R&D unit of Rinnai Corp is the Research & Development Headquarters, located in the Technology Development Center in Oguchi, Aichi Prefecture. This unit is responsible for product development, technology development, electronic development, and design. It includes facilities for product design, performance testing, and environmental testing to evaluate multiple installation environments. In FY2025, the company incurred expenses of JPY149,000 million on R&D, which, as a percentage of revenue, stood at 32.4%.