Navien NPE-150S2 Standard Condensing Tankless Water Heater

Navien NPE-150S2 Standard Condensing Tankless Water Heater

The Navien NPE-150S2 is a high-efficiency, standard condensing tankless water heater engineered for energy-saving, continuous hot water performance in residential and light commercial applications. Featuring dual stainless steel heat exchangers and advanced burner technology, it provides reliable operation, superior corrosion resistance, and ultra-low $\text{NO}_x$ emissions.

Key Features & Specifications

• Performance & Efficiency: Delivers up to 150,000 BTU/h with a high Uniform Energy Factor (UEF) of 0.96 for maximum energy savings.

• Dual Stainless Steel Heat Exchangers: Resists scale buildup and corrosion, ensuring long-term durability and consistent heat transfer efficiency.

• Flexible Venting: Compatible with 2" or 3" PVC, CPVC, ULC S636, or polypropylene venting up to 150 feet.

• Field Convertibility: Easy field conversion between Natural Gas (NG) and Liquid Propane (LP) using the included conversion kit.

• EZNav Control Panel: Front-facing digital control panel allows simple setup, temperature adjustments, and intuitive troubleshooting.

• Cascading Capability: Connect up to 32 units together to meet demanding commercial hot water requirements.

Navien NPE-150S2 Technical Specifications

Performance & Fuel Input

• Heat Input Range: 18,000 – 120,000 BTU/h

• Uniform Energy Factor (UEF): 0.93 – 0.96

• Maximum Flow Rate: Up to 6.8 GPM (at 35°F temperature rise)

• Turn Down Ratio (TDR): 6.7:1

• Gas Supply Pressure: 3.5" to 10.5" W.C. (Natural Gas); 8.0" to 13.0" W.C. (Liquid Propane)

Dimensions & Physical Specs

• Dimensions (H × W × D): 27.4" × 17.3" × 13.2"

• Weight: 62 lbs

• Installation Type: Indoor or Outdoor Wall-Mounted

• Casing Material: Cold Rolled Steel

• Heat Exchanger: Primary & Secondary Dual Stainless Steel

Piping Connections & Sizes

• Cold Water Inlet: 3/4" NPT

• Hot Water Outlet: 3/4" NPT

• Gas Inlet Connection: 3/4" NPT

• Condensate Drain Connection: 1/2" NPT

Venting Specifications

• Venting System: Forced Draft Direct Vent / Non-Direct Vent

• Vent Materials: PVC, CPVC, Approved Polypropylene, Stainless Steel

• 2" Venting Distance: Up to 75 ft

• 3" Venting Distance: Up to 150 ft

Electrical Data

• Power Supply: 120V AC, 60 Hz

• Max Operating Amperage: 2A to 4A

• Maximum Power Consumption: 200W – 350W

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