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Product Description Efficiency:. 67 EF - Performance: FHR: Up to 87 gallons for 50-gallon models and up to 71 gallons for 40-gallon models, Recovery rate is 32.4 to 42.4 for 50-gallon models and 32.4 to 40.4 for 40-gallon models at a 90 degree rise - Self-Diagnostic System: Electronic gas control for improved monitoring and service - Low Emissions: Eco-friendly burner, low Knox design. From the Manufacturer Efficiency:. 67 EF - Performance: FHR: Up to 87 gallons for 50-gallon models and up to 71 gallons for 40-gallon models, Recovery rate is 32.4 to 42.4 for 50-gallon models and 32.4 to 40.4 for 40-gallon models at a 90 degree rise - Self-Diagnostic System: Electronic gas control for improved monitoring and service - Low Emissions: Eco-friendly burner, low NOx design