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
NPE-150S2
NPE-180A2 NPE-180S2 NPE-210A2 NPE-210S2 NPE-240A2 NPE-240S2
Heat
Capacity
(Input)
Natural Gas,
Propane Gas
18,000-
120,000
BTU/H
10,000-150,000 BTU/H 12,000-180,000 BTU/H 13,300-199,900 BTU/H
Uniform
Energy
Factor
UEF (for NG & LP) 0.93 0.95 0.96 0.95 0.96 0.95 0.96
Flow Rate
(DHW)
35 °F (19 °C)
Temp Rise
6.8 GPM
(25.8 L/m)
8.4 GPM (32 L/m) 10.1 GPM (38 L/m) 11.2 GPM (42 L/m)
45 °F (25 °C)
Temp Rise
5.3 GPM
(20 L/m)
6.5 GPM (25 L/m) 7.8 GPM (30 L/m) 8.7 GPM (33 L/m)
67 °F (36 °C)
Temp Rise
3.4 GPM
(13 L/m)
4.3 GPM
(16 L/m)
4.4 GPM
(17 L/m)
5.1 GPM
(19 L/m)
5.3 GPM
(20 L/m)
5.6 GPM
(21 L/m)
5.8 GPM
(22 L/m)
Dimensions 17.3 in. (W) x 27.4 in. (H) x 13.2 in. (D)
Weight
62 lbs
(28 kg)
73 lbs
(33 kg)
68 Ibs
(31 kg)
77 Ibs
(35 kg)
73 lbs
(33 kg)
77 Ibs
(35 kg)
73 lbs
(33 kg)
Installation Type Indoor or Outdoor Wall-Hung
Venting Type Forced Draft Direct Vent
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-13in. WC
Natural Gas Manifold Pressure
(min-max)
–0.04 in. WC
- –0.40 in. WC
–0.03 in. WC - –0.55 in. WC –0.03 in. WC - –0.76 in. WC –0.03 in. WC - –0.96 in. WC
Propane Gas Manifold Pressure
(min-max)
–0.03 in. WC
- –0.40 in. WC
–0.02 in. WC - –0.55 in. WC –0.02 in. WC - –0.76 in. WC –0.02 in. WC - –0.96 in. WC
Minimum Flow Rate 0.5 GPM (1.9 L/m), < 0.01 GPM (0.04 L/m) option for “A2” models*
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
Maximum Power
Consumption
200 W (max 2 A), 350 W (max 4 A) with external pump connected
Materials
Casing Cold Rolled Carbon Steel
Heat Exchangers
Primary Heat Exchanger: Stainless Steel
Secondary Heat Exchanger: Stainless Steel
Venting
Exhaust
2 in. or 3 in. PVC, CPVC, Approved Polypropylene
2 in. or 3 in. Special Gas Vent Type BH (Class II, A/B/C)
Intake
2 in. or 3 in. PVC, CPVC, Approved Polypropylene
2 in. or 3 in. Special Gas Vent Type BH (Class II, A/B/C)
Vent Clearances 0 in. to combustibles
Safety
Devices
Flame Rod, APS, Ignition Operation Detector, Water Temperature High Limit Switch, Exhaust Temperature High
Limit Sensor, Power Surge Fuse, Burner High Limit Fuse, Vent Installation Detector (VID)
* Available for “A2” models when the optional ComfortFlow recirculation is active. Energy consumption will increase when the
system is configured for circulation.
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