Tankless
Gas – PROPANE
Gas – NATURAL GAS

High Efficiency Condensing Tankless Water Heater

MODEL: NPE-150S2

High Efficiency Condensing Tankless Water Heater

NPE-150S2

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Specification

Use and Care Manual

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	206423843
Energy Star Certified	Yes

Efficiency Ratings*

Uniform Energy Factor (UEF)	0.93
MAX GPM (67ºF Rise)	3.4 GPM (12.9 l/m)

Annual Energy Consumption * (Residential)

Natural gas (Therms/Year)	120.0
Propane (Gallons/Year)	131 gal (495.9 l)
Natural Gas Estimated Operating Cost**	$131
Propane Estimated Operating Cost**	$316

*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-180A2
35 ºF (19.4 ºC) rate	11.2 GPM (42.4 l/m)
40 ºF (22.2 ºC) rate	9.8 GPM (37.1 l/m)
45 ºF (25 ºC) rate	8.7 GPM (32.9 l/m)
50 ºF (27.8 ºC) rate	7.8 GPM (29.5 l/m)
55 ºF (30.6 ºC) rate	7.1 GPM (26.9 l/m)
60 ºF (33.3 ºC) rate	6.5 GPM (24.6 l/m)
65 ºF (36.1 ºC) rate	6 GPM (22.7 l/m)
70 ºF (38.9 ºC) rate	5.6 GPM (21.2 l/m)
75 ºF (41.7 ºC) rate	5.2 GPM (19.7 l/m)
80 ºF (44.4 ºC) rate	4.9 GPM (18.5 l/m)
85 ºF (47.2 ºC) rate	4.6 GPM (17.4 l/m)
90 ºF (50 ºC) rate	4.4 GPM (16.7 l/m)
100 ºF (55.6 ºC) rate	3.9 GPM (14.8 l/m)
110 ºF (61.1 ºC) rate	3.6 GPM (13.6 l/m)
120 ºF (66.7 ºC) rate	3.3 GPM (12.5 l/m)
130 ºF (72.2 ºC) rate	3 GPM (11.4 l/m)
140 ºF (77.8 ºC) rate	2.8 GPM (10.6 l/m)

DHW Capacity

Model	NPE-150S2
Natural gas	18,000 – 120,000 BTU/h (5.274 – 35.16 kWh)
Propane	18,000 – 120,000 BTU/h (5.274 – 35.16 kWh)

Specifications

Heat capacity (input)	Natural gas	18,000 – 120,000 BTU/h (5.274 – 35.16 kWh)
	Propane	18,000 – 120,000 BTU/h (5.274 – 35.16 kWh)
Efficiency ratings	UEF (NG & LP)	0.93
Flow rate (DHW)	35 ºF temp rise	6.8 GPM (25.7 l/m)
	45 ºF temp rise	5.3 GPM (20.1 l/m)
	67 ºF temp rise	3.4 GPM (12.9 l/m)

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-150S2 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.