7About the Boiler
General Specifications
Item NHB-055H NHB-080H NHB-110H NHB-150H
Dimensions 17.3 in (W) x 12.8 in (D) x 23.8 in (H)
Weight 73 lb (33 kg) 80 lb (36 kg)
Installation Type Indoor Wall-Hung
Venting Type Forced Draft Direct Vent
Ignition Electronic Ignition
Natural Gas Supply Pressure (from
source)
3.5 in–10.5 in WC
Propane Gas Supply Pressure (from
source)
8.0 in–13.5 in WC
Natural Gas Manifold Pressure -0.11 in WC -0.17 in WC -0.26 in WC -0.40 in WC
Propane Gas Manifold Pressure -0.11 in WC -0.17 in WC -0.25 in WC -0.41 in WC
Gas Connection Size 3/4 in NPT
Power Supply
Main Supply 120V AC, 60Hz
Maximum Power
Consumption
Less than 15 amperes
Materials
Casing Cold-rolled carbon steel
Heat Exchangers Primary and Secondary Heat Exchangers: Stainless Steel
Venting
Exhaust
2 in or 3 in PVC, CPVC, approved polypropylene*
2 in or 3 in Special Gas Vent Type BH (Class III, A/B/C), Stainless Steel
Intake
2 in or 3 in PVC, CPVC, polypropylene
2 in or 3 in Special Gas Vent Type BH (Class III, A/B/C), Stainless Steel
Vent Clearance 0 in to combustibles
Safety Devices
Flame Rod, APS, Ignition Operation Detector
Water Temperature High Limit Switch, Exhaust Temperature High
Limit Sensor, Water Pressure Sensor, Vent Installation Detector (VID)
* For more information about the approved vent materials, refer to “5.4 Selecting Vent Pipe Materials” on page 61.
Temperature Setting Range
Item Temperature Setting Range Remarks
Space
Heating
Supply 77–185°F (25-85°C)
Actual supply and return temperatures
vary depending on the selected outdoor
reset curve.
Return 68–158°F (20-70°C)
Note
For more information about the space heating temperature setting range, refer to “11.8 Setting the
Space Heating Operation” on page 104.
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