Who makes the highest quality tankless water heater is debated, but top brands considered highest quality are Rinnai, Navien, and Noritz, Japanese and Korean brands known for reliability, efficiency, and warranty, with Rinnai often considered highest quality. Rinnai, Japanese company founded 1920 in Japan, makes tankless water heaters in Japan and USA, considered highest quality by many plumbers and consumers, with models like Rinnai RU199, RUR199, known for durable heat exchanger, long warranty 12 to 15 years, high efficiency up to 0.93 UEF, reliable, with good customer service and parts availability, averaging 4.5 stars, costing $1000 to $2000. Navien, Korean company founded 1978 in South Korea, makes high-quality condensing tankless water heaters with dual stainless steel heat exchangers, high efficiency up to 0.96 UEF, with built-in recirculation and smart features, considered highest quality for efficiency, warranty 15 years, costing $1200 to $2200. Noritz, Japanese company founded 1951, also high quality, with Takagi owned by Noritz, makes reliable units. For highest quality, Rinnai is often ranked number one for reliability and longevity, Navien number one for efficiency and features, with both considered highest quality tankless water heater brands, with Rinnai being most recommended by plumbers for highest quality and reliability, with units lasting 20 years with maintenance.
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