ENVO WH-AZ53-180-LPO
0.84 UEF DOE CCD · 2026-09-19Grade F: 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).
If you are checking ENVO WH-AZ53-180-LPO, the figure is 202 therms of natural gas a year. That figure belongs to the high draw pattern, the standard daily hot-water usage DOE tests against. The class median is 182 therms, so this unit sits 20 therms above it.
Energy use per year
202 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 228 of 397, lowest energy first.
Solid line: this model (202 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
- 0.84 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
- 4.5 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,839–$2,798 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 ENVO model on file
What this brand files, by heater type.
UEF 0.84 · Grade F Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.84 for this unit. Its maximum flow rate in gallons per minute is 4.5. The annual figure of 202 therms was computed by this site, not the registry. It combines the registry UEF with the daily hot-water draw that the DOE test assigns to the high draw pattern. The result applies only under that condition. The source is DOE CCD, retrieved 2026-09-19. A household with different hot-water use will see a different total.
Among the 397 models registered as a gas tankless unit at the high draw pattern, this unit holds rank 228th lowest energy use of 397. Its 202 therms is 20 therms above the class median of 182 therms. That puts it in the second-highest quarter of its class for energy use. The high draw pattern describes a larger household, or one where showers and laundry overlap. For that use, the figure is a comparison point, not a measurement of any single home. Models ranked ahead of it use less energy at the same draw. To look for one, find a same-class replacement by model number.
The running cost is not stated here. It depends on the state average residential gas price, which differs by location. Enter your ZIP in the cost calculator for your own ZIP to apply that price to 202 therms. The method behind the annual cost is documented separately. The installed price range appears in its own block with its source and date, so it is not repeated in this text. A home with lighter use than the high draw pattern should not read 202 therms as its own. The figure for other draw patterns is not available on this page.
DOE CCD · 2026-09-19