Navien NR-240A/NR-240 – Gas Tankless Water Heater

Navien NR-240A / NR-240 Gas Tankless Water Heater
BTU: 20,000-199,000 BTU/h

Household Capacity: At 35˚F Rise : 11 GPM At 45˚F Rise : 8.6 GPM At 77˚F Rise : 5.1 GPM

Product Features:

NR-240A / NR-240

Input 20,000~199,000 BTU/h
EF (Natural Gas) 0.95
EF (Propane Gas) 0.97
Flow Rate At 35˚F Rise : 11 GPM
At 45˚F Rise : 8.6 GPM
At 77˚F Rise : 5.1 GPM

The Ultimate in Energy Efficiency with Hi-Tech Comfort
-Easy installation and PVC venting
-3″ SCH 40 solid PVC up to 100′
-Industry’s highest energy efficiency rating
-Ready Link® Cascade System
-Optional built-in recirculation system with buffer tank
-Advanced Eco Navien technology
-Extended lifecycle utilizing dual stainless steel heat exchangers
-Advanced remote control – NR-10DU
-Industry’s best warranty!


With Navien Condensing, you get the best of both worlds: the Best Value and “Ultra Condensing Efficiency,” which offers substantial savings and contributes to a green-friendly environment. Plus, the installation and venting processes are easy, cost effective, and Navien’s products are simply the best in quality and performance.

Ultra Condensing Efficiency
Navien’s condensing efficiency boasts the industry’s highest efficiency. Customers can take advantage of the low annual operating costs and receive the best value and payback, compared with conventional tankless or tank-type water heaters.

Extended Lifecycle
Navien utilizes dual stainless steel heat exchangers, providing a longer life-expectancy and more resistance to erosion than copper heat exchangers used in other water heaters. Navien’s stainless steel heat exchangers operate with relatively low water temperatures, minimizing damage from hard water conditions and maintains a high efficiency level.

Endless Hot Water Supply
Navien’s Condensing Tankless Water heaters offer an unlimited supply of hot water to meet a home’s unending demand for hot, soothing water!

Easily Installed PVC Venting
The high efficiency of Navien’s Condensing Tankless Water Heater results in lower exhaust temperatures, allowing for the use of 3″ SCH 40 PVC venting.

•  PVC venting offers a significant cost savings when compared with other venting materials.
•  PVC venting is lightweight and easily slides together, reducing installation time and making it easy to run a 100 feet of venting.
•  * Each elbow deduct 5′ off of venting length

Eco Navien Technology
•  Navien’s condensing technology uses less gas than conventional water heaters, resulting in less CO2 emissions.
•  The Eco Pre-mixed Burner dramatically reduces NOx emission levels, making it the lowest emission levels in the industry.

Each Navien Unit Installed Equates to 31 Cypress Trees.
A Navien Condensing water heater reduces up to 964 lbs of CO2 per year compared to a conventional water heater, and up to 324 lbs of CO2 per year compared to a tankless water heater.

Optional Circulation Pump and Mini Buffer Tank (Model “A”)
•  No minimum flow rate required with optional internal circulation mode
•  minimize hot/cold/hot stacking, the so called “Cold Water Sandwich”
•  Save installation cost with optional circulation pump and buffer tank
•  The Ready-Link® Cascading System can combined “A” models units and non “A” model units together to save money on installation costs and conserve water.

Space Saving Design
Navien’s condensing tankless water heater’s compact, wall mount design occupies approximately 80% less space than a traditional 50 gallon tank-type water heater*. Navien’s compact design adds free space that can be used to store other house hold items.
* (Navien NR/NP 240A compared with AO Smith GVP-50, Dec 2010)

Advanced Technology

① Enhanced Safety with Dual Microprocessors
Navien’s two microprocessors offer better control and safer operation by continuously cross monitoring each other’s performance to assure proper operation at all times.
These two microprocessors not only control the burner for ideal combustion but also maintain the steady hot water temperature.

② Optimal and Stable Combustion with APS and GPS
APS (Air Pressure Sensor) maximizes combustion efficiency by sensing and controlling the air required for optimal combustion even in high-wind locations and installations with long vent runs.

GPS (Gas Pressure Sensor) offers stable combustion by sensing gas pressure and controlling the fan speed to maintain optimal combustion, even under a wide range of gas-pressure changes.

③ Three-phased, Pre-Mixed Burner
Controls flame by pre-mixing optimal ratio of gas and air before combustion, reducing emissions and enhancing heat efficiency.

④ Leak Detector
Built-in leak detector prevents damage to water heater as well as personal property.

⑤ Air Intake Filter
An air intake filter prevents foreign substances, such as dust or insects, from entering the system, freeing the burner from elements that would normally cause unstable combustion or energy inefficiency.

Remote Control (NR-10DU)
•  Advanced water heater diagnosis capability and error feedback
•  Touch activated backlight function and Easy-to-Use button type control
•  Built-in recirculation timer for water and energy savings
•  Key-pad lock button prevents inadvertent temperature changes
•  Temperature adjustment in 1°F increments between 98-120°F