Founded in 1920, Rinnai is built upon a rich history of success in manufacturing high quality water and home heating gas appliances. With an uncompromising resolve for constant improvement, Rinnai has mastered the art in saving homeowners money without sacrificing comfort. Whether you need a home heating furnace, a tankless water heater, or a condensing boiler, Rinnai’s heating appliances are carefully engineered to be the most reliable on the market.