RHEEM/ECOSENSE RTG-84XLN-1
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 checking the RHEEM/ECOSENSE RTG-84XLN-1, a gas tankless unit, it uses 209 therms of natural gas a year. That figure belongs to 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 models in its class.
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
- 4.5 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.
UEF 0.81 · Grade G Price it on your ZIP
The 209 therms figure was calculated by this site. The registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. For this model, the listed UEF is 0.81, based on DOE CCD data retrieved on 2026-09-19. There are 397 gas tankless units registered at the high draw pattern. For lowest energy use, this model ranks 323rd of 397. That places it in the highest quarter of its class for energy use. The figure applies only at the federal test's daily draw. This page does not show energy use at any other daily draw. The page on how the annual cost is calculated sets out the steps behind the calculation.
The high draw pattern describes a larger household, or one where showers and laundry overlap. For that kind of household, the 209 therms figure is the matching point of comparison. The registry lists this model's maximum flow rate in gallons per minute as 4.5. A household with lower daily hot-water use falls outside this figure. This page does not show the model's energy use at a lower draw pattern. Within its class, the model uses 27 therms more than the 182 therms median. Given its rank of 323rd, most registered units at this draw pattern use less energy in the test. If you want to check it against models from the same class, use the same-class replacement search by model number.
This text does not give a running cost. The cost depends on the average residential natural gas price in your state, so the page calculates it from your ZIP. Your yearly cost at the high draw pattern is 209 therms multiplied by that rate. This page does not estimate a figure for it. The 27 therms gap to the class median works the same way. What that gap costs you also depends on your own rate. Enter your ZIP in the water heater cost calculator for your ZIP to see both on your own rate. The installed price range has 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