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High-efficiency low Nox Eco-Burner reduces emissions Natural gas tankless hot water heater Indoor Use Only ecoTough tankless condensing heater Cold and Hot water connection size: 3/4" Gas connection size: 1/2" Power Supply: 120 VAC (60 Hz) Exhaust vent diameter requirements: 3" Exhaust vent material requirement: PVC or CPVC 5 Year Parts Warranty Specifications : Indoor Unit Dimensions : 20.5" (H) x 13.8" (W) x 6.7" (D) Gas Consumption : Min: 15,000 btuh Max: 120,000 btuh Capacity Range : 0.5-6.6 Gal./min. Energy Factor : 0.91 Thermal Efficiency : 93% Temperature Settings : 100-140°F (In 5°F intervals) (9 Options) (Price subject to change without notice. Check stock before order)