LOCHINVAR ATI-140B-N 1**
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 verifying this unit, the LOCHINVAR ATI-140B-N 1** 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.
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
- 3.6 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
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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 LOCHINVAR 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 was computed by this site, not published by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, of 0.81. That ratio is combined with the daily hot-water draw the DOE test assigns to the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. The figure applies only at that test draw and only to natural gas. A household that draws more or less hot water than the test day will use a different amount of gas. This page has no data on how much different.
Among the 80 models registered as a gas tankless unit at the medium draw pattern, this unit ranks 52nd lowest in energy use. That puts it in the second-highest quarter of its class for energy use. Its 137 therms is 2 therms above the class median of 135 therms. The gap is stated in therms only. This page suits a reader checking a quoted figure against the registry. It does not suit a reader who needs the lowest use in the class, since models ranked ahead of 52nd use less gas at this draw. To compare, use the selector by fuel, space and size or find a same-class replacement by model number.
Running cost is not stated here, because it depends on your state's average residential gas price. Multiply 137 therms by your own price per therm, or use the cost calculator on your own ZIP. The method for the annual cost is documented separately. The registry lists a maximum flow rate in gallons per minute of 3.6. That is a capacity limit and does not change the therms figure. The installed-cost range appears in its own block with its source and date, as a modeled range and not a quote. Actual use in your home is unknown, because it depends on your own hot-water draw.
DOE CCD · 2026-09-19