7About the Water Heater
2.3 Specifications
The following table lists the specifications for the water heater. Additional specifications about water, gas,
electric, and air supplies (venting) appear in the Installation section.
Item
Universal Outdoor
NPN-160U-
NG
NPN-160U-
LP
NPN-180U-
NG
NPN-180U-
LP
NPN-199U-
NG
NPN-199U-
LP
NPN-120E-
NG
NPN-120E-
LP
NPN-160E-
NG
NPN-160E-
LP
NPN-180E-
NG
NPN-180E-
LP
NPN-199E-
NG
NPN-199E-
LP
Heat
Capacity
(Input)
Natural Gas
10,700-
160,000
BTU/H
10,700-
180,000
BTU/H
10,700-
199,900
BTU/H
10,700-
120,000
BTU/H
10,700-
160,000
BTU/H
10,700-
180,000
BTU/H
10,700-
199,900
BTU/H
Propane Gas
Uniform
Energy
Factor
UEF
(for NG & LP)
0.81 0.81 0.81 0.81 0.81 0.81 0.81
Flow Rate
(DHW)
45 °F (25 °C)
Temp Rise
5.8 GPM
(22 L/m)
6.6 GPM
(25 L/m)
7.4 GPM
(28 L/m)
4.2 GPM
(15.9 L/m)
5.8 GPM
(22 L/m)
6.6 GPM
(25 L/m)
7.4 GPM
(28 L/m)
67 °F (36 °C)
Temp Rise
4.0 GPM
(15 L/m)
4.5 GPM
(17 L/m)
5.0 GPM
(19 L/m)
2.9 GPM
(11 L/m)
4.0 GPM
(15 L/m)
4.5 GPM
(17 L/m)
5.0 GPM
(19 L/m)
Dimensions 14.0 in (W) x 23.0 in (H) x 9.3 in (D)
Weight (Gross) 55 lbs (25 kg) 60 lbs (27 kg) 60 lbs (27 kg) 55 lbs (25 kg) 55 lbs (25 kg) 60 lbs (27 kg) 60 lbs (27 kg)
Installation Type
Indoor Wall-Hung
(Vent Kit Optional for Outdoor)
Only Outdoor Wall-Hung
Venting Type Forced Draft Direct Vent (Indoor only)
Ignition Electronic Ignition
Water Pressure 15-150 PSI
Natural Gas Supply
Pressure
(from source)
3.5 in WC-10.5 in WC
Propane Gas Supply
Pressure (from source)
8 in WC-13 in WC
Natural Gas Manifold
Pressure (Max.–Min.)
2.83 in W.C,
0.70 in W.C
2.25 in WC,
0.53 in WC
2.81 in WC,
0.53 in WC
2.99 in W.C,
0.67 in W.C
3.23 in W.C,
0.69 in W.C
2.38 in WC,
0.53 in WC
2.99 in WC,
0.52 in WC
Propane Gas Manifold
Pressure (Max.–Min.)
5.93 in W.C,
1.38 in W.C
5.28 in WC,
1.31 in WC
6.55 in WC,
1.31 in WC
6.65 in W.C,
1.54 in W.C
6.34 in W.C,
1.35 in W.C
5.39 in WC,
1.28 in WC
6.61 in WC,
1.28 in WC
Minimum Flow Rate 0.5 GPM (1.9 L/m)
Connection
Sizes
Cold Water
Inlet
3/4 in NPT
Hot Water
Outlet
3/4 in NPT
Gas Inlet 3/4 in NPT
Power
Supply
Main Supply 120 V AC, 60 Hz
Normal 90 W 88 W 120 W 90 W 90 W 88 W 120 W
Standby 4 W
Anti-frost 114 W
External
Pump
< 150 W, 1.5 A
Fuse 5.0 A
Materials
Casing Cold Rolled Carbon Steel
Heat
Exchangers
Stainless Steel
Safety Devices
Flame Rod, APS, Vent Installation Detector, Ignition Operation Detector,
Water Temperature High Limit Switch, Power Surge Fuse
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