NSS Product Knowledge and Specifications 2 — Questions and Answers
Question 1: What is the Uniform Energy Factor (UEF) rating for the Navien NPE-A series condensing tankless water heaters?
- 0.87
- 0.92
- 0.97 (Correct answer)
- 0.99
Correct answer: 0.97
The Navien NPE-A series achieves a UEF of 0.97, making it one of the most efficient residential tankless water heaters available.
Question 2: What is the minimum modulating input BTU/hr for the Navien NPE series tankless water heaters?
- 10,000 BTU/hr
- 15,000 BTU/hr
- 19,500 BTU/hr (Correct answer)
- 25,000 BTU/hr
Correct answer: 19,500 BTU/hr
All NPE series units modulate down to a minimum of 19,500 BTU/hr, allowing precise output matching to demand.
Question 3: What is the maximum domestic hot water outlet temperature setting on NPE series tankless water heaters?
- 120°F
- 130°F
- 140°F (Correct answer)
- 160°F
Correct answer: 140°F
NPE series units have a maximum outlet temperature setting of 140°F, though 120°F is recommended to prevent scalding.
Question 4: What is the operating water pressure range for Navien NPE series tankless water heaters?
- 10–100 PSI
- 15–150 PSI (Correct answer)
- 20–120 PSI
- 25–80 PSI
Correct answer: 15–150 PSI
NPE series units require a minimum of 15 PSI and can handle a maximum static water pressure of 150 PSI.
Question 5: What electrical supply is required for Navien NPE series tankless water heaters?
- 120V AC, 60Hz, less than 2A (Correct answer)
- 120V AC, 50Hz, less than 5A
- 240V AC, 60Hz, 20A
- 240V AC, 60Hz, less than 2A
Correct answer: 120V AC, 60Hz, less than 2A
NPE series units require 120V AC, 60Hz with a current draw under 2 amps, requiring only a standard household circuit.
Question 6: What is the maximum GPM flow rate of the Navien NPE-240A at a 35°F temperature rise?
- 9.0 GPM
- 10.5 GPM
- 11.5 GPM (Correct answer)
- 13.0 GPM
Correct answer: 11.5 GPM
The NPE-240A delivers up to 11.5 GPM at a 35°F temperature rise, making it the highest-capacity unit in the NPE-A lineup.
Question 7: What type of primary heat exchanger material does Navien use in its condensing NPE series units?
- Cast iron
- Stainless steel (Correct answer)
- Copper
- Aluminum
Correct answer: Stainless steel
Navien uses a stainless steel primary heat exchanger in NPE series units, providing corrosion resistance and durability with condensing flue gases.
NSS Product Knowledge and Specifications 2
What is the Uniform Energy Factor (UEF) rating for the Navien NPE-A series condensing tankless water heaters?