LAARS LT199NXX1**
0.96 UEF DOE CCD · 2026-09-19Grade A: 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).
Checking this model's energy figure: LAARS LT199NXX1**, a gas tankless unit, uses 176 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 6 therms below the class median of 182 therms, and it ranks 12th lowest of 397 models.
Energy use per year
176 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 below the median of 182 therms for the 397 models registered in the same heater type and draw pattern; it ranks 12 of 397, lowest energy first.
Solid line: this model (176 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
- 0.96 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
- 5.8 gal/min DOE CCD · 2026-09-19
- On the market since (ENERGY STAR) the date the manufacturer told ENERGY STAR the model went on sale
- 2024-11-30 ENERGY STAR · 2026-09-19
- Connected / demand response (ENERGY STAR) whether the unit can take signals from your utility to shift when it heats, and by which standard (such as CTA-2045)
- No ENERGY STAR · 2026-09-19
- Sound level (ENERGY STAR) how loud the unit is while it runs, in decibels as filed
- 44 dB ENERGY STAR · 2026-09-19
What it costs to install
$2,405–$3,460 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 · 2026-09-24Does it fit your space?
Enter your own numbers below — this compares them to what ENERGY STAR publishes for this model, it does not tell you what to buy.
- Dimensions (ENERGY STAR)
- the unit's filed height, width, depth or tank diameter, in inches
- Input voltage and maximum current (ENERGY STAR)
- the circuit voltage the unit is certified on and the most current it draws
- Vent type and size (ENERGY STAR)
- how a gas unit is vented, the vent's diameter and the height of its vent connector
What 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 LAARS model on file
What this brand files, by heater type.
UEF 0.96 · Grade A Price it on your ZIP
The figure of 176 therms is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.96 with the DOE test's daily hot-water draw for the high draw pattern. It applies to natural gas only, and only at that draw. A household that uses more or less hot water than the test assumes will use a different amount of gas. The registry also lists a maximum flow rate in gallons per minute of 5.8 for this unit. The energy source is DOE CCD, retrieved 2026-09-19.
Against its class, this unit sits 6 therms below the median of 182 therms. The class is the 397 models registered as a gas tankless unit at the high draw pattern, and a rank of 12th lowest places this unit in the lowest quarter of that class for energy use. The comparison describes a larger household, or one where showers and laundry overlap. The registry data used here does not give this unit's energy at any other draw pattern, so that value is not available. For a household with a different pattern, try the water heater selector by fuel, space and size or look up a same-class replacement by model number.
The running cost is not stated in this text, because it depends on the state average residential gas price. Applying your own rate to 176 therms gives the yearly cost at the high draw pattern, and other usage levels change the result. To have the page do this from your ZIP, use the cost calculator for your own ZIP. The steps behind that calculation are described in how the annual cost is calculated. The installed price range for LAARS LT199NXX1** appears in its own block on the page with its source and date. It is a modeled installed-cost range, not a quote, and this text does not restate it.
DOE CCD · 2026-09-19