RINNAI RE140I (REU-VE1720FFD-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).
For a quick check, the RINNAI RE140I (REU-VE1720FFD-US) uses 137 therms of natural gas a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 2 therms above the class median of 135 therms across 80 gas tankless models. It ranks 52nd lowest for energy use.
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
- 3.1 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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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 is computed by this site, not published by the registry. The site starts from the registry's UEF, the ratio of hot water delivered to energy used. This unit's listed UEF is 0.81. The site then applies the federal test's daily hot-water draw for the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. The result applies only to natural gas at that draw pattern. The class median is 135 therms, and this model sits 2 therms above it. Its rank of 52nd lowest of 80 places it in the second-highest quarter of its class for energy use.
The 137 therms figure fits a household that matches the medium draw pattern, meaning a typical three- or four-person household. The registry lists a maximum flow rate in gallons per minute of 3.1. This page does not state how many fixtures that rate serves at once, so that is unknown here. A household with heavier or lighter use than the medium draw pattern should not read 137 therms as its own figure. Energy figures for other draw patterns are not available on this page. To compare units by fuel, space and size, use the water heater selector. To look for a same-class unit, find a replacement by model number.
Multiplying 137 therms by your state average residential gas price gives the yearly running cost. The price differs by state, so this text names no cost. Enter your ZIP in the cost calculator to price the figure at your own rate. The 2 therms gap to the class median of 135 therms converts to a cost difference at that same price. The method behind the annual cost lists each step of the calculation. A modeled installed-cost range appears in its own block on this page, with its source and date. It is a modeled range, not a quote, and it is not repeated here.
DOE CCD · 2026-09-19