Navien Premium NPE-150S2 Condensing Tankless Water Heater

The Navien NPE-150S2 Condensing Tankless Water Heater is a compact, high-efficiency hot-water system designed for smaller homes and residential applications with moderate hot-water demand. With up to 120,000 BTU/h of heating input, a 0.93 UEF rating and flow rates up to 6.8 GPM at a 35°F temperature rise, it provides reliable on-demand hot water without requiring a conventional storage tank.

The NPE-150S2 heats water only when a hot-water fixture is being used, helping reduce the standby energy loss associated with traditional tank-style water heaters. Its modulating burner adjusts operation according to the current demand, supporting efficient gas consumption during different levels of household use.

Advanced condensing technology captures additional heat from combustion exhaust before it leaves the system. This recovered heat contributes to the unit’s 0.93 UEF rating and helps improve fuel efficiency compared with many conventional storage water heaters.

The unit features dual stainless-steel heat exchangers designed to provide corrosion resistance, efficient heat transfer and dependable long-term operation. Its field-convertible gas system is supplied for natural gas and can be converted to propane by a qualified professional using the appropriate conversion components.

Measuring approximately 17.3 inches wide, 27.4 inches high and 13.2 inches deep, the wall-mounted cabinet saves valuable floor space. It can be installed indoors or outdoors with the appropriate Navien outdoor vent kit, providing flexibility for replacement projects and new residential installations. Outdoor installation should only be considered where the climate and installation requirements permit.

The built-in EZNav™ multiline control panel provides convenient temperature adjustment, operating information and system monitoring. Additional capabilities include built-in HotButton™ control, electronic ignition, cascading capability and common venting for compatible multi-unit installations.

Low exhaust temperatures allow the use of approved PVC, CPVC, polypropylene or stainless-steel venting. Two-inch venting can extend up to 75 equivalent feet, helping simplify installation when all manufacturer instructions and applicable building codes are followed.

Key Features

Up to 120,000 BTU/h Heating Input
Provides responsive hot-water performance for properly sized homes with moderate demand.

0.93 UEF High-Efficiency Performance
Condensing technology captures additional exhaust heat to support efficient natural-gas or propane operation.

Up to 6.8 GPM Flow Rate
Delivers up to 6.8 GPM at a 35°F temperature rise, with actual flow depending on incoming-water temperature and the required outlet temperature.

Continuous On-Demand Hot Water
Heats water when required without relying on the limited capacity of a conventional storage tank.

Dual Stainless-Steel Heat Exchangers
Provides durable, corrosion-resistant construction for dependable long-term performance.

Natural Gas and Propane Convertible
Supplied for natural gas and field convertible to propane by a qualified service professional.

Compact Wall-Mounted Design
Saves valuable floor space and offers flexible placement in utility rooms, basements and mechanical areas.

EZNav™ Digital Control Panel
Provides intuitive temperature adjustment, operating information and system monitoring.

External Recirculation Compatible
Can work with an approved externally controlled recirculation system when configured and installed correctly.

Flexible Venting Options
Supports approved PVC, CPVC, polypropylene and stainless-steel venting, including two-inch venting up to 75 equivalent feet.

Low-NOx Operation
Produces less than 20 ppm NOx to support cleaner combustion.

Manufacturer Warranty Protection
Includes a 15-year limited heat-exchanger warranty and a five-year limited parts warranty for qualifying residential installations with standard or controlled recirculation. Manufacturer terms and conditions apply.

Why Buy the Navien NPE-150S2 Tankless Water Heater?

The Navien NPE-150S2 is a practical choice for homeowners seeking efficient on-demand hot water in a compact, wall-mounted system. Its 0.93 UEF rating, dual stainless-steel heat exchangers, digital controls and flexible venting design provide a dependable balance of efficiency, durability and everyday convenience.

Available hot-water flow depends on the incoming-water temperature and required temperature rise. Contact ZERO HVACR for a free quote and professional assessment to confirm whether the Navien NPE-150S2 has the correct capacity for your household.