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Ultra Collection Liquid Propane High Efficiency Condensing External Whole House Tankless Water Heater 8.0 Gallons Per MinuteSuitable for mid to large sized homes RinnaiÂ’s new Ultra Series Condensing Tankless Water Heaters offer all the same benefits builders and homeowners have come to expect from Rinnai. Never run out of hot water again and enjoy the space savings convenience ease of installation and peace of mind for which Rinnai is famous.The Efficiency of Condensing TechnologyRinnaiÂ’s unique condensing design incorporates two innovative heat exchangers to achieve optimum heating value from every cubic foot of natural gas or propane. The stainless steel system recaptures residual heat from flue gases to pre-heat incoming ground water which then circulates to the primary copper heat exchanger. Delivering an Energy Factor (EF) up to .96 RinnaiÂ’s tankless condensing units are ideal for residential and commercial applications and can be banked for even greater capacity.Qualifies For Federal Tax CreditA tankless water heater is an energy-efficient water heating system that heats water only when itÂ’s needed. These space-saving long-lasting water heaters provide an endless stream of clean hot water for all your appliances simultaneously without temperature fluctuations. And all while saving you up to 40% in energy costs!Features:ENERGY STAR QualifiedCondensing Technology for Greater Efficiency and Significant Energy SavingsUp to 97% Thermal EfficiencyHot Water Capacity: 0.4 to 6.0 GPM @ 50- F Rise and 0.4 to 8.0 GPM @ 35- F RiseLiquid Propane FuelOutdoor Installation OnlyPre-set at 120-F98- F to 140- F Residential Temperature Range98- F to 185- F Commercial Temperature RangeCommercial Controller Must be Purchased SeparatelyElectronic IgnitionGas Rate Inp[]