Navien NPE-180A2

Navien NPE-180A2 is a gas tankless water heater from Navien rated 4.3 GPM at a 0.95 UEF.

Efficiency
Uniform Energy Factor (UEF) 0.95
Annual gas use (natural gas) 178 therms/yr
Annual propane use 194.53 gal/yr
General
Fuel Natural Gas, Propane
Capacity
Max flow rate 4.3 GPM
Draw pattern High
Minimum activation flow 1 GPM
Performance
Gas input rate 150 kBTU/h
Installation
Max current draw 2 A
Vent type Power Direct Vent
Vent size 2
Smart features
Smart / connected capable No
Dimensions
Height 27 in
Width 17 in
Depth 13 in
Certification
ENERGY STAR certified Yes

Real flow rate by climate

A tankless heater's usable flow depends on how far it must raise incoming water temperature. Sustained hot-water flow of the Navien NPE-180A2 at common temperature rises (a typical shower uses about 2 GPM of mixed water):

Temperature rise Climate Sustained flow Simultaneous showers
45 °F Warm climate (~75 °F groundwater) 4.3 GPM 2
55 °F Mild climate (~65 °F groundwater) 4.3 GPM 2
70 °F Cold climate (~50 °F groundwater) 4.1 GPM 2
77 °F DOE test condition 3.7 GPM 1

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Frequently asked questions

Is the Navien NPE-180A2 ENERGY STAR certified?

Yes, the Navien NPE-180A2 holds a current ENERGY STAR certification for water heating efficiency (UEF 0.95).

How much does the Navien NPE-180A2 cost to run per year?

About $258 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.

What venting does the Navien NPE-180A2 use?

The Navien NPE-180A2 uses Power Direct Vent venting with 2 in vent connections. Matching the existing vent type is usually the cheapest replacement path.

Is the Navien NPE-180A2 a smart water heater?

No, the Navien NPE-180A2 is not connected-capable — it has no app connectivity or demand-response support.

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