• Tankless
  • Gas – PROPANE
  • Gas – NATURAL GAS

High Efficiency Condensing Tankless Water Heater

MODEL:  NPE-180S2

High Efficiency Condensing Tankless Water Heater

NPE-180S2

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Overview
  • ½” gas pipe capable up to 24′
  • Field convertible gas system
  • Ultra condensing efficiency
  • Dual stainless steel heat exchangers
  • Low NOx emissions (20ppm)
  • SCH 40, 2″ venting up to 75′
  • Cascading capable
  • EZNav multi-line control panel
  • Built-in HotButton control panel
  • Common vent up to 12 units
Dimensions
Width 17.3″ (43.9 cm)
Height 27.4″ (69.6 cm)
Depth 13.2″ (33.5 cm)

 

Connections Sizes

(A) Air Intake 2″
(B) Exhaust Gas Vent 2″
(C) Hot Water Outlet 3/4″
(D) Gas Inlet 3/4″
(E) Recirculation Inlet 3/4″
(F) Consensate Outlet 1/2″
(G) Cold Water Inlet 3/4″

     

Certification Summary

All NPE-2 models are field convertible from NG to LP gas.

Product Approvals

CSA Yes
NSF (Standard 5) Yes
Low Lead (<0.25%) Yes
SCAQMD 1146.2 (NOx, <20ppm) Yes
AHRI Number 206368360
Energy Star Certified Yes

Efficiency Ratings*

Uniform Energy Factor (UEF) 0.96
MAX GPM (67ºF Rise) 4.3 GPM (16.3 l/m)

Annual Energy Consumption * (Residential)

Natural gas (Therms/Year) 177.0
Propane (Gallons/Year) 194 gal (734.4 l)
Natural Gas Estimated Operating Cost** $193
Propane Estimated Operating Cost** $468

*Based on U.S. Department of Energy (DOE) test procedures.

** Based on a national avergae natural gas cost of $1.09/therm, propane cost of $2.41/gallon.

Certifications / Qualifications

Temperature Rise
Temp Rise NPE-180S2
35 °F (19.4 °C) rate 8.4 GPM (31.8 l/m)
40 °F (22.2 °C) rate 7.4 GPM (28 l/m)
45 °F (25 °C) rate 6.5 GPM (24.6 l/m)
50 °F (27.8 °C) rate 5.9 GPM (22.3 l/m)
55 °F (30.6 °C) rate 5.3 GPM (20.1 l/m)
60 °F (33.3 °C) rate 4.9 GPM (18.5 l/m)
65 °F (36.1 °C) rate 4.5 GPM (17 l/m)
70 °F (38.9 °C) rate 4.2 GPM (15.9 l/m)
75 °F (41.7 °C) rate 3.9 GPM (14.8 l/m)
80 °F (44.4 °C) rate 3.7 GPM (14 l/m)
85 °F (47.2 °C) rate 3.5 GPM (13.2 l/m)
90 °F (50 °C) rate 3.3 GPM (12.5 l/m)
100 °F (55.6 °C) rate 2.9 GPM (11 l/m)
110 °F (61.1 °C) rate 2.7 GPM (10.2 l/m)
120 °F (66.7 °C) rate 2.5 GPM (9.5 l/m)
130 °F (72.2 °C) rate 2.3 GPM (8.7 l/m)
140 °F (77.8 °C) rate 2.1 GPM (7.9 l/m)
DHW Capacity
Model NPE-180S2
Natural gas 10,000 – 150,000 BTU/h (2.93 – 43.95 kWh)
Propane 10,000 – 150,000 BTU/h (2.93 – 43.95 kWh)
Specifications
Heat Capacity (input) Natural gas 10,000 – 150,000 BTU/h (2.93 – 43.95 kWh)
Propane 10,000 – 150,000 BTU/h (2.93 – 43.95 kWh)
Efficiency ratings UEF (NG & LP) 0.96
Flow rate (DHW) 35°F temp rise 8.4 GPM (31.8 l/m)
45°F temp rise 6.5 GPM (24.6 l/m)
67°F temp rise 4.3 GPM (16.3 l/m)
Dimensions 17.3″ W x 27.4″ H x 13.2″ D (43.9cm W x 69.6cm H x 33.5cm D)
Boiler weight 68 lbs (30.8 kg)
Installation type Indoor or outdoor wall-hung
Ignition Electronic ignition
Water pressure 15-150 PSI (1.055-10.545 kg/cm2)
Natural gas supply pressure (from source) 3.5 ” WC to 10.5 ” WC (0.87 Kpa to 2.61 Kpa)
Propane gas supply pressure (from source) 8 ” WC to 13 ” WC (1.99 Kpa to 3.23 Kpa)
Natural gas manifold pressure (min-max) -0.03 ” WC to -0.55 ” WC (-0.0075 Kpa to -0.14 Kpa)
Propane gas manifold pressure (min-max) -0.02 ” WC to -0.55 ” WC (-0.005 Kpa to -0.14 Kpa)
Minimum flow rate 0.5 GPM (1.893 l/m)
Connection sizes Cold water inlet 3/4″ NPT
Hot water outlet size 3/4″ NPT
Gas inlet 3/4″ NPT
Power supply Main supply 120V 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″ or 3″ PVC, CPVC, approved polypropylene and stainless steel 2″ or 3″ special gas vent type BH (Class II, A /B/C)
Intake 2″ or 3″ PVC, CPVC, approved polypropylene and stainless steel 2″ or 3″ special gas vent type BH (Class II, A /B/C)
Vent clearances 0″ to combustibles
High elevations 10,100 feet for both NG or LP gas. Please refer to Installation Manual for additional details and instructions.
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)
Dimensions 17.3″ W x 27.4″ H x 13.2″ D (43.9 cm W x 69.6 cm H x 33.5 cm D)
Boiler weight 62 lbs (28.1 kg)
Installation type Indoor or outdoor wall-hung
Ignition Electronic ignition
Water pressure 15-150 PSI (1.055-10.545 kg/cm2)
Natural gas supply pressure (from source) 3.5″ WC to 10.5″ WC (0.87 Kpa to 2.61Kpa)
Propane gas supply pressure (from source) 8″ WC to 13″ WC (1.99 Kpa to 3.23 Kpa)
Natural gas manifold pressure (min-max) -0.04 ” WC to -0.4 ” WC (-0.0099 Kpa to -0.099 Kpa)
Propane gas manifold pressure (min-max) -0.03 ” WC to -0.4 ” WC (-0.0075 Kpa to -0.099 Kpa)
Minimum flow rate 0.5 GPM (1.893 l/m)
Connection sizes Cold water inlet 3/4″
  Hot water outlet size 3/4″
  Gas inlet 3/4″
Power supply Main supply 120V 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″ or 3″ PVC, CPVC, approved polypropylene and stainless steel 2″ or 3″ special gas vent type BH (Class II, A/B/C)
  Intake 2″ or 3″ PVC, CPVC, approved polypropylene and stainless steel 2″ or 3″ special gas vent type BH (Class II, A/B/C)
  Vent clearances 0″ to combustibles
High elevations 10,100 feet for both NG or LP gas. Please refer to installation Manual for additional details and instructions.
Safety Devices Flame rod, APS, ingnition 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 NPE-A2 models configured in an optional ComfortFlow® recirculation mode. Energy consumption will increase when the system is configured for recirculation.

NPE-180S2 premium features and benefits

2" PVC venting up to 75 feet

Low exhaust gas temperatures allow use of PVC (including schedule 40 PVC), CPVC, popypropylene (rigid and flexible) and stainless steel venting, saving time and costs.

Vent Installation Detector (VID) for added safety.

Dual Venturi for field gas conversions

Dual Venturi system creates better combustion control and turndown ratio.

Dual stainless steel heat exchangers

for added durability

EZNav™ Multi-line control with built-in intuitive software

1/2" gas pipe capability up to 24'

(subject to local codes). Cuts installation time, no need to install new gas lines for retrofit applications.

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