Noritz NRC98OD (GQ-C2857WS US)
0.92 UEF DOE CCD · 2026-09-19Grade C: 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 Noritz NRC98OD (GQ-C2857WS US), a gas tankless unit, this site calculates that it uses 184 therms of natural gas a year. That figure is for the high draw pattern, the standard daily hot-water usage DOE tests against. It sits 2 therms above the class median of 182 therms, ranking 207th lowest energy use of 397.
Energy use per year
184 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 207 of 397, lowest energy first.
Solid line: this model (184 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
- 0.92 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
- 5.2 gal/min DOE CCD · 2026-09-19
What it costs to install
$2,216–$3,239 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 Noritz model on file
What this brand files, by heater type.
UEF 0.92 · Grade C Price it on your ZIP
The registry does not print the 184 therms figure. This site calculated it from two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model. The second is the DOE test's daily hot-water draw for the high draw pattern. The source is DOE's Compliance Certification Database (CCD), retrieved 2026-09-19. So the figure describes the federal test's daily draw, not a measured household. This data does not show how the yearly use changes for a home that draws more or less hot water than the test. The steps behind the calculation are set out in how the annual cost is calculated. A plumber or seller checking a quoted figure should compare it against 184 therms under the same high draw pattern.
The high draw pattern stands for a larger household, or one where showers and laundry overlap. That is the use for which the 184 therms figure holds. The registry lists this model's maximum flow rate in gallons per minute as 5.2. Whether 5.2 covers the fixtures in a particular home is not available in this data. The ranking compares the 397 models registered as a gas tankless unit at the high draw pattern. It does not include other fuels or storage tanks. For a household nearer a lower draw pattern, the 184 therms figure does not describe its expected use. To compare across fuel, space and size, use the selector by fuel, space and size. To list other models in this class, use a same-class replacement search by model number.
The text gives no running cost for this model. The cost of 184 therms of natural gas a year depends on your state's average residential gas price. The page therefore calculates it from your ZIP in the cost calculator on your own ZIP. At any one gas rate, this model's yearly cost is higher than a model at the class median by the cost of 2 therms. How large that gap is depends on your rate, so the text does not state it. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote, and this text does not repeat its figures.
DOE CCD · 2026-09-19