LOCHINVAR ATI-199B-N 1**
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).
For the LOCHINVAR ATI-199B-N 1**, a gas tankless unit, the annual figure is 206 therms of natural gas a year. This is at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 24 therms above the class median of 182 therms, and it ranks 229th lowest of 397.
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
- 5.2 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 LOCHINVAR model on file
What this brand files, by heater type.
UEF 0.82 · Grade G Price it on your ZIP
The 206 therms figure is not read from the registry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.82 for this unit. It also uses the DOE test's daily hot-water draw for the high draw pattern. The result is in natural gas and applies only to that test draw. Real use changes with household demand and incoming water temperature, and this page holds no data on either. Against its class, the unit sits 24 therms above the median of 182 therms. That is the second-highest quarter for energy use, at 229th lowest of 397 models. The methodology page shows the calculation.
The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's maximum flow rate in gallons per minute is 5.2. That is the registry's stated maximum. It does not show how the unit performs when several fixtures run together. The figure of 206 therms fits a reader who wants to check this model at that draw. It does not fit a lighter draw pattern, because no figure was computed for that case and none is available here. The median of 182 therms covers only the 397 gas tankless models registered at the high draw pattern, so comparisons with other classes do not hold. The replacement finder looks up same-class models by model number.
The running cost is not stated in the text. It depends on the average residential gas price in your state, which the page applies from your ZIP. The same 206 therms gives a different yearly cost at each gas rate. A cost quoted for another state therefore does not carry over to your home. To check any result, multiply 206 therms by your own gas rate, in matching units. The installed price range appears in its own block with its source and date. It is a modeled range, not a quote, and it is not repeated here. The cost calculator applies your ZIP to this model. The energy data comes from DOE CCD, retrieved 2026-09-19.
DOE CCD · 2026-09-19