Navien NPE-240S2 is a top-tier tankless water heater designed for households with 4–5 bathrooms. Offering a robust 199,000 BTU heating capacity and a maximum flow of 11.2 gallons per minute (GPM), it guarantees a steady supply of hot water even during high-demand periods.
Navien NPE-240S2 stands out as a reliable and energy-efficient solution for homeowners seeking a high-performance tankless water heater. Its impressive heating capacity, super high-efficiency performance, and natural gas operation with direct venting make it a smart investment for those looking to reduce energy costs while ensuring a continuous supply of hot water. The compact, wall-mounted design saves valuable space, and the long lifespan with low maintenance requirements adds to its appeal.
Whether you’re upgrading your current water heating system or building a new home, Navien NPE-240S2 offers the reliability, efficiency, and performance you need to meet your hot water demands.
Navien Premium NPE-240S2 Condensing Tankless Water Heater is engineered to deliver high-performance hot water for modern homes. With an impressive 199,000 BTU heating capacity and a maximum flow rate of 11.2 gallons per minute (GPM), this condensing unit ensures a reliable and continuous supply of hot water for households with multiple bathrooms.
| Item | NPE-240S2 | |
|---|---|---|
| Heat Capacity (input) | Natural gas | 13,300 - 199,900 BTU/h (3.9 - 58.57 kWh) |
| Propane | 13,300 - 199,900 BTU/h (3.9 - 58.57 kWh) | |
| Efficiency ratings | UEF (NG & LP) | 0.96 |
| Uef Mx | ||
| Flow rate (DHW) | 35°F temp rise | 11.2 GPM (42.4 l/m) |
| 45°F temp rise | 8.7 GPM (32.9 l/m) | |
| 67°F temp rise | 5.8 GPM (22 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 | 73 lbs (33.1 kg) | |
| Installation location | Indoor or outdoor wall-hung | |
| Venting type | Forced draft direct-vent | |
| Ignition | Electronic ignition | |
| Water pressure | 15-150 PSI (1.05-10.55 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 -0.96 " WC (-0.0075 kPa to -0.24 kPa) | |
| Propane gas manifold pressure (min-max) | -0.02 " WC to -0.96 " WC (-0.005 kPa to -0.24 kPa) | |
| Minimum flow rate | 0.5 GPM (1.9 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) | |
*Available for NPE-A2 models configured in an optional ComfortFlow® recirculation mode. Energy consumption will increase when the system is configured for recirculation.
Navien reserves the right to change specifications at any time without prior notice.
| Model | NPE-240S2 |
|---|---|
| Natural gas | 13,300 - 199,900 BTU/h (3.9 - 58.57 kWh) |
| Propane | 13,300 - 199,900 BTU/h (3.9 - 58.57 kWh) |
| Product | Labor | Parts | Heat Exchanger |
|---|---|---|---|
| NPE-S2 Advanced (Residential) Standard or Controlled Recirculation | 1 Year | 5 Years | 15 Years |
| 1 Year | 3 Years | 5 Years | |
| NPE-S2 Advanced (Commercial or Combi) Standard or Controlled Recirculation | 1 Year | 5 Years | 8 Years |
| 1 Year | 3 Years | 3 Years |
Notes:
½” gas pipe can be used when installing a NPE condensing gas tankless water heater as long as it is sized appropriately.
Pipe size, length of gas pipe, and pressure drop are all factors that affect gas delivery.
Please refer to the National Fuel Gas Code gas pipe sizing table to ensure you have sufficient gas supply for the unit.
No, it is not required that the NPE condensing tankless gas water heater be the first appliance off the gas meter.
It can be installed using the existing infrastructure and can go in place of a traditional tank water heater so long as the gas line is sized appropriately and can deliver sufficient gas supply to the unit.
The NPE is approved to be vented with 2”vent material (maximum length of 60’, maximum of 6 elbows, and reduce 8 linear feet per 90° elbow). 3” vent material can also be used (maximum length of 150’, maximum of 8 elbows, and reduce 5 linear feet per 90° elbow).
Approved vent materials are PVC Schedule 40, CPVC Schedule 80, ApprovedPolypropylene.
Yes, with the NPE condensing tankless gas water heater you can use PVC Schedule 40, which allows for zero inch clearance to combustibles.
Yes, the NPE has built in display and control allowing for simple and easy operation.
There will be an optional external remote available for purchase in late 2012.
ComfortFlow technology is a proprietary system that incorporates a buffer tank and recirculation pump.
The buffer tank will reduce “cold water sandwich” effects commonly found with tankless products and the recirculation pump will minimize the amount of time required for delivery of hot water to fixtures.
Yes, the NPE can be mounted outdoors using the Navien Outdoor Vent Kit.
It is recommended the unit only be mounted outdoors in mild climates.
Please follow proper instruction procedures outlines in installation manual.
Yes, the NPE is gas field convertible.
The default gas type for the unit will be Natural Gas (NG). To convert the unit for LP use, please use gas conversion kit supplied with unit.
This should only be performed by a qualified service agency in accordance with Navien America’s instructions.
