RINNAI RE140E (REU-VE1720WD-US)
0.81 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 80 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tankless unit, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
If you are checking the RINNAI RE140E (REU-VE1720WD-US) against the registry, it uses 137 therms of natural gas a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. That is 2 therms above the class median of 135 therms across 80 gas tankless models at the same draw pattern.
Energy use per year
137 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 135 therms for the 80 models registered in the same heater type and draw pattern; it ranks 52 of 80, lowest energy first.
Solid line: this model (137 therms). Dashed line: the class median.
Min 114 therms Median 135 therms Max 137 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 medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 3.2 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 RINNAI model on file
What this brand files, by heater type.
UEF 0.81 · Grade G Price it on your ZIP
The figure of 137 therms comes from this site's calculation, not from the registry itself. It combines the UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that DOE assigns to the medium draw pattern. The registry lists the UEF as 0.81. That pattern stands for a typical household on a busy morning, so the figure describes that use and no other. The registry also lists the maximum flow rate in gallons per minute as 3.2. The energy figure is for natural gas and was retrieved from the DOE CCD on 2026-09-19. Registry data do not show how much gas a specific installation burns in a specific home.
Against the 80 gas tankless models registered at the medium draw pattern, this unit ranks 52nd lowest in energy use. It sits 2 therms above the class median of 135 therms, which places it in the second-highest quarter of its class. That position suits a household whose use matches the medium draw pattern and who is verifying a listed figure. It does not suit a reader who needs the lowest energy use in the class, because other models in the class use less. Other draw patterns are not available for this model, so a household with different use cannot read its own gas use from 137 therms. The selector by fuel, space and size narrows models on those terms. A same-class replacement by model number can be found from RE140E (REU-VE1720WD-US).
The running cost is not written here because it depends on your state's average residential gas price, and that price differs by location. The cost calculator takes your ZIP and applies that price to the 137 therms at the medium draw pattern. The method is described under how the annual cost is calculated. The result is only as close to your bill as your household is to the medium draw pattern. The 2 therms gap to the class median of 135 therms is measured in gas use, and its cost depends on the same rate. The modeled installed-cost range appears in its own block with its source and date. It is not a quote. Gas price is not part of the registry data, so no cost figure is available in this text.
DOE CCD · 2026-09-19