NAVIEN NHW700-199SE-NG
0.81 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 397 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tankless unit, high draw pattern (a larger household, or one where showers and laundry overlap).
If you are verifying the NAVIEN NHW700-199SE-NG, a gas tankless unit, it uses 209 therms of natural gas a year. That figure holds at the high draw pattern, the standard daily hot-water usage DOE tests against. It sits 27 therms above the 182 therms median of the 397 gas tankless models registered at the same draw pattern.
Energy use per year
209 therms a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the natural gas rate where you live.
That is above the median of 182 therms for the 397 models registered in the same heater type and draw pattern; it ranks 323 of 397, lowest energy first.
Solid line: this model (209 therms). Dashed line: the class median.
Min 173 therms Median 182 therms Max 209 therms
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 0.81 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tankless unit at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 5.1 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,698–$2,632 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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How to size a tankless water heater by GPM
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All gas tankless water heaters
Gas-fired instantaneous units, sized by flow rate rather than tank gallons.
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Every NAVIEN model on file
What this brand files, by heater type.
UEF 0.81 · Grade G Price it on your ZIP
This site calculated the 209 therms figure; the registry does not list it. The calculation uses the model's UEF, the ratio of hot water delivered to energy used. It applies that ratio to the DOE test's daily hot-water draw for the high draw pattern. The registered UEF for this model is 0.81, from the DOE CCD, retrieved 2026-09-19. The result reflects the federal test's daily usage, not a measured home. This data cannot show how far your own gas use differs from it. The class is the 397 gas tankless models registered at the high draw pattern. In that class, this model ranks 323rd for lowest energy use, which places it in the highest quarter for energy use. The steps behind the figure are on the page explaining how the annual energy and cost are calculated.
The high draw pattern stands for a larger household, or one where showers and laundry overlap. The registered maximum flow rate in gallons per minute for this model is 5.1. The 209 therms figure applies only to use that matches the high draw pattern. For a smaller household with lighter daily use, this data has no figure for this model. The 323rd rank noted above means that other models in the same class use less energy at this draw pattern. You can list them with the same-class replacement search by model number. To narrow models by fuel, space and size instead, use the water heater selector by fuel, space and size. Neither tool changes the 209 therms figure for this model at the high draw pattern.
The page text gives no running cost for this model. The cost of 209 therms of natural gas a year depends on your state's average residential gas price. The page therefore works it out from your ZIP. The cost calculator for your own ZIP uses the same method. The 27 therms gap above the 182 therms class median, stated above, works the same way. What that gap costs depends on your gas rate at the high draw pattern. The installed price range appears in its own block with its source and date. It is a modeled installed-cost range, not a quote. Energy use and cost for any draw pattern other than high are not available in this data.
DOE CCD · 2026-09-19