Navien Installation clearances (indoor / outdoor)
Navien Installation clearances (indoor / outdoor): reference table for the tankless water heater (Navien NPN series): a quick-reference table with notes.
Navien Installation clearances (indoor / outdoor) table
| Side | Indoor: combustibles | Indoor: non-combustibles | Outdoor: combustibles | Outdoor: non-combustibles |
|---|---|---|---|---|
| Top | 6 in. (152 mm) | 2 in. (51 mm) | 12 in. (305 mm) | 2 in. (51 mm) |
| Back | 0 in. | 0 in. | 0 in. | 0 in. |
| Front | 6 in. (152 mm) | 6 in. (152 mm) | Panel 24 in. (610 mm); exhaust 24 in. (610 mm) | Panel 0 in.; exhaust 24 in. (610 mm) |
| Sides | 2 in. (51 mm) | 1/2 in. (13 mm) | 6 in. (152 mm) | 1/8 in. (3.2 mm) |
| Ground / bottom | 12 in. (305 mm) | 12 in. (305 mm) | 12 in. (305 mm) | 2 in. (51 mm) |
| Vent | 0 in. | 0 in. | - | - |
How to use the Navien Installation clearances (indoor / outdoor) table
Find your exact model in the first column and read across the row. Values in the Navien Installation clearances (indoor / outdoor) table are a summary for quick reference; the rating plate on the unit and the manufacturer's manual for your model always decide. If your model is not listed, or a value looks different from what you see on the unit, check the manual before changing anything.
Notes
- Room temp must stay between 32 F (0 C) and 120 F (49 C).
- Outdoor models need a weather-rated disconnect switch for the 120 V supply.
- Indoor models: rated to 10,100 ft (3,078 m). Outdoor models: under 4,500 ft only.
Applies to: Navien NPN non-condensing tankless water heaters: NPN-160U/180U/199U (universal, indoor or outdoor with vent kit) and NPN-120E/160E/180E/199E (outdoor only)
Navien models this applies to
NPN-120ENPN-160ENPN-160UNPN-180ENPN-180UNPN-199ENPN-199U
Navien Tankless Water Heater error codes →
Source: Navien NPN-U/NPN-E Installation Manual, 3.1 Adequate installation clearances, p.17; 3.6, p.47; 3.7.2, p.49. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.