Ruud RTG-84XLN-3
0.82 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 Ruud RTG-84XLN-3, it uses 206 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 24 therms above the 182 therms median for its class, where it ranks 229th lowest energy use of 397 gas tankless models at that pattern.
Energy use per year
206 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 229 of 397, lowest energy first.
Solid line: this model (206 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
- 0.82 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
- 4.4 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,745–$2,687 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 Ruud model on file
What this brand files, by heater type.
UEF 0.82 · Grade G Price it on your ZIP
The 206 therms per year comes from this site's calculation, not from the registry. It combines the model's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high pattern. The registry lists this unit at a UEF of 0.82, in DOE CCD data retrieved 2026-09-19. The annual figure is therefore a natural gas value at test conditions, not a meter reading. It holds at the federal test's daily draw. It does not describe a home that draws more or less hot water than the test assumes. The inputs and steps are set out in the methodology for water heater energy and cost figures.
The high draw pattern stands for a larger household, or one where showers and laundry overlap. The registry lists a maximum flow rate in gallons per minute of 4.4 for this model. The 24 therms gap above its class median places it in the second-highest quarter of its class for energy use. A reader who wants lower gas use at this pattern will find registered models in the same class that use less. Those can be checked by model number through a same-class replacement search, or by fuel, space and size in the water heater selector. Energy use for this model at a lower draw pattern is not available on this page.
No running cost appears in this text, because it depends on your state's average residential gas price. The page computes it from your ZIP, applying that price to the 206 therms per year at the test draw. Any cost difference from the class median also depends on that rate, applied to the 24 therms gap. To see the figure for your own rate, use the cost calculator on your own ZIP. The installed-cost range sits in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote.
DOE CCD · 2026-09-19