HVACopediaNavien · Combi boiler
Heat Capacity Status Information item 2 - Heat Capacity
What the display is showing
Current heat output as a percentage. Read-only item 2 in the Status Information menu.
Applies to: NCB-190/060H to NCB-250/150H
What to do
- Menu > 1. Status Information > scroll to the item.
Settings for these units
Minimum installation clearances (indoor) · Navien NCB-H
| Side | Minimum |
|---|---|
| Top | 9 in (229 mm) |
| Back | 0.5 in (13 mm) |
| Front | 4 in (100 mm) |
| Sides | 3 in (76 mm) |
| Bottom | 12 in (300 mm) |
Indoor wall-hung only; ambient must stay above 32°F (0°C).
Do not install on carpet; leave room for service.
Water quality limits (DHW and system fill) · Navien NCB-H
| Contaminant | Max allowed |
|---|---|
| Total hardness | 200 mg/l (12 grains/gallon) |
| Aluminum | 0.05 to 0.2 mg/l |
| Chloride | 250 mg/l |
| Copper | 1.0 mg/l |
| Iron | 0.3 mg/l |
| Manganese | 0.05 mg/l |
| pH | 6.5 to 8.5 |
| Sulfate | 250 mg/l (DHW table); 205 mg/l (fill table) |
| Total dissolved solids | 500 mg/l |
| Zinc | 5 mg/l |
| Chlorine (fill water) | 4 mg/l |
Scale damage from poor water is not covered by warranty.
Manual shows sulfate 250 mg/l on p.23 and 205 mg/l on p.29 - check local guidance.
Models that show this code
5 models in Navien NCB-H
Other codes on the same units
- Fan Target RPM Status Information item 18 - Fan Target RPM
- Flame Value Status Information item 17 - Flame Value
- Flow Control Valve Status Information item 22 - Flow Control Valve
- Gas Status Information item 31 - Gas
- High Altitude Status Information item 28 - High Altitude
- Inlet Temp Status Information item 12 - Inlet Temp
- Main F/W Ver Status Information item 32 - Main F/W Ver
- Mixing Valve Status Information item 23 - Mixing Valve
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Navien NCB-H User's Information Manual (V1.0 Apr 2024), 3.3 Accessing Basic Menu Items, p.12-13. Summarized in our own words; check the original manual for your model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.