Navien NHW-AE Series 199 MBH Outdoor Non-Condensing Propane Gas Tankless Water Heater
Core Features & Advantages
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Non-Condensing Design (UEF ~0.81)
Offers efficient and reliable operation without needing a condensate drain, typically smaller and lower maintenance than condensing units.Navien+1 -
ComfortFlow® Built-In Recirculation System
A standout feature among non-condensing models—includes a buffer tank and recirculation pump, delivering hot water quickly and eliminating cold-water “sandwich” delays.Navien+1 -
Premium Internal Components
Uses NaviTech™ stainless steel heat exchanger and burner, enhancing durability, efficiency, and longevity.Navien+1 -
Built-in Safety & Smart Controls
Includes:-
Air Pressure Sensor (APS) for stable air/gas ratio and safe operation.
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Vent Installation Detector (VID) for monitoring proper vent setup.
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Water Adjustment Valve (WAV) and mixing valve to maintain consistent water temperature despite flow changes.Navien+1
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Outdoor-Ready Build
Designed specifically for exterior mounting (NHW-AE), eliminating the need for indoor space or venting considerations. Optional recess box available.Navien+1 -
Cascading Capability
Can be cascaded with additional units for higher demand setups—ideal for larger homes or light-commercial use.Navien+1
Model Spotlight: NHW-199AE (199,900 BTU/hr)
| Spec | Detail |
|---|---|
| Fuel Options | Natural Gas (NG) or Liquid Propane (LP)NavienPACE Supply |
| Input Capacity | 199,900 BTU/hr (~199 MBH)NavienPACE Supply |
| Energy Factor (UEF) | ~0.81 (high efficiency for non-condensing)Navien+1 |
| Flow Rate | Up to ~9.5 GPM at 35 °F temperature riseNavien+1PACE Supply |
| Vent Type | Forced-draft direct vent; concentric 3″ × 5″ standardNavien+1PACE Supply |
| Dimensions | 26.5″ H × 17.3″ W × 10.3″ DNavienPACE Supply |
| Weight | ~65 lb (per Ferguson spec)Ferguson |
| Water Connection | ¾″ NPTPACE SupplyFerguson |
| Gas Connection | ¾″ NPTPACE Supply |
| Temp Range | 98 °F – 140 °FFergusonPACE Supply |
| Certifications | AHRI, CSA, possibly NSF depending on modelPACE SupplyFerguson |
| Warranty | 15 years heat exchanger; 5 years parts; 1 year labor (residential), similar commercial coveragePACE Supply |
Why It Matters
The Navien NHW-AE Series (especially the 199 MBH model) stands out as one of the only non-condensing gas tankless units with built-in recirculation, enhancing user comfort while avoiding condensate management. With stainless steel internals, comprehensive safety systems, outdoor-friendly design, and cascading options, it suits both demanding residential and commercial applications.
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