Wikipedia
Rinnai
Rinnai Corporation is a company based in Nagoya, Japan, that manufactures gas appliances, including energy-efficient tankless water heaters, home heating appliances, and boilers.
Incorporated in 1920, Rinnai has 20 branches, six domestic production facilities, and 86 sales offices globally including Australia, Brazil, Hong Kong, Indonesia, Italy, Malaysia, New Zealand, China, Singapore, South Korea, Taiwan, Thailand, the United Kingdom, Vietnam, and the United States.
The company produces its own branded tankless water heaters, as well as rebranded units sold by manufacturers such as Bradford White and GE.