Which brand of tankless water heater is better, Rinnai or Noritz?

Which brand of tankless water heater is better, Rinnai or Noritz, both are top Japanese brands considered highest quality, with Rinnai often considered slightly better for reliability and parts availability, while Noritz slightly better for efficiency and features, both excellent brands. Rinnai, Japanese company founded 1920 in Japan, makes tankless water heaters, models RU199, RUR199 with recirculation, known for very reliable, durable, with 12 to 15 year warranty, good customer service, wide parts availability in USA, averaging 4.5 stars, costing $1000 to $2000, with Rinnai being most recommended by plumbers for reliability, with units lasting 20 years. Noritz, Japanese company founded 1951 in Kobe, Japan, makes tankless water heaters, models EZ Series, NRCB, NCC, known for high efficiency up to 0.95 UEF, condensing models, with built-in recirculation and WiFi on some, warranty 12 to 15 years, averaging 4.4 stars, costing $1000 to $2200, with Noritz slightly better for efficiency and commercial applications, owning Takagi brand. For better, Rinnai better for residential reliability, parts availability, and customer service in USA, with more installers familiar, while Noritz better for high efficiency, condensing technology, and commercial use, with both good. So Rinnai slightly better for most homeowners for reliability and support, Noritz slightly better for efficiency and features, both top quality Japanese brands.