United Plumbing & Fire Supplies
Navien NHW-199AE Non‑Condensing Tankless Water Heater (Outdoor)
Navien NHW-199AE Non‑Condensing Tankless Water Heater (Outdoor)
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Product Description:
The Navien NHW‑199AE is Navien’s highest-capacity outdoor tankless water heater, engineered for powerful performance in exterior installations. With a full 199,900 BTU input and integrated ComfortFlow® technology, this model includes a built-in recirculation pump and buffer tank for faster hot water and stable temperatures — even during peak demand.
Designed for durability and convenience, the NHW-199AE uses a stainless steel heat exchanger and burner, and installs cleanly without the need for indoor venting. It’s ideal for large homes in warmer climates or properties without interior venting access.
Key Specifications & Benefits:
| Feature | Specification / Benefit |
|---|---|
| BTU Input | 199,900 BTU — Navien’s most powerful NHW-A model |
| ComfortFlow® | Integrated recirc pump + buffer tank for immediate hot water |
| Installation | Outdoor-only — vent-free design for simplified setup |
| Heat Exchanger & Burner | Corrosion-resistant stainless steel |
| Efficiency | 0.81 Uniform Energy Factor (UEF) |
| Flow Rate | ~7.7 GPM at 45°F temp rise |
| Fuel | Compatible with natural gas or propane |
| Power Supply | 120V AC, standard residential outlet |
| Emissions | Ultra-low NOₓ (<20 ppm) |
| Warranty | 15 years on heat exchanger, 5 years parts (residential) |
Why Choose NHW-199AE?
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Maximum Outdoor Output: Handles high-demand households with ease.
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ComfortFlow® System: Reduces hot water lag and prevents cold bursts.
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Zero Venting Required: Perfect for areas where indoor installation isn’t possible.
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Stainless Construction: Resists corrosion, even in exposed environments.
Ideal Applications:
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Large single-family homes with outdoor space
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Exterior retrofits where venting is not feasible
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Warm or temperate climates needing on-demand hot water
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