Which brand of gas tankless hot water heater is best based on reliability, efficiency, and Consumer Reports in 2026 is Rinnai, Navien, and Rheem as top 3. First, Rinnai gas tankless like RUR160 and RSC160 is considered best overall with highest reliability and service rates under 5 percent, made in Japan, offering up to 0.93 Uniform Energy Factor high efficiency, built-in recirculation pump that eliminates cold water sandwich and provides hot water in seconds, WiFi connectivity, and excellent warranty at 12-year heat exchanger, 5-year parts, costing 1,800 to 2,800 dollars installed for 160,000 BTU, with very good parts availability. Second, Navien NPE-2 series is best for high efficiency condensing with up to 0.95 UEF, dual stainless steel heat exchangers, built-in recirculation, and good value at 1,700 to 2,600 dollars installed, service rates around 6 to 8 percent. Third, Rheem RTGH-95 and RTG-84 offer good value with 0.93 UEF, decent reliability with service rates around 8 to 10 percent, and lower cost at 1,500 to 2,400 dollars installed, plus wide availability at Home Depot. All top brands offer condensing that extracts extra heat from exhaust. For budget, Takagi and Noritz offer decent at 1,200 to 2,000 dollars. Rinnai is consistently ranked highest for reliability and customer satisfaction, with Navien best for efficiency, Rheem best for value and availability.
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