ENVO WH-AZ04-199-LPI
0.85 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).
You are checking one unit's registry figures. The ENVO WH-AZ04-199-LPI uses 199 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 17 therms above the class median of 182 therms.
Energy use per year
199 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 227 of 397, lowest energy first.
Solid line: this model (199 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
- 0.85 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 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,886–$2,853 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 ENVO model on file
What this brand files, by heater type.
UEF 0.85 · Grade F Price it on your ZIP
This site computes the 199 therms figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.85 for this model. It also uses the daily hot-water draw that the DOE test assigns to the high draw pattern. The result is stated in therms of natural gas. The figure applies only at that test draw, and its source is DOE CCD, retrieved 2026-09-19. A home's own hot-water use is not part of the calculation. The steps for how the annual cost is calculated are on the methodology page.
The high draw pattern describes a larger household, or one where showers and laundry overlap. This unit's maximum flow rate in gallons per minute is 5. Among 397 gas tankless models registered at this draw pattern, it ranks 227th lowest in energy use. That is in the second-highest quarter of its class for energy use. Its 199 therms is 17 therms above the class median of 182 therms. A reader who wants the lowest energy use in this class will find other models that use less. The figure does not describe a household with lighter hot-water use, because it is tied to the high draw pattern. To compare against other units, find a same-class replacement by model number.
The running cost is not stated here because it depends on your state's average residential gas price. Multiplying 199 therms by your own gas rate per therm gives the yearly cost at this draw pattern. The cost calculator on your own ZIP does this for you. The cost therefore changes with the gas price in each state, while the 199 therms figure stays fixed for this draw pattern. The installed price appears in its own block with its source and date, as a modeled range and not a quote. Figures for other draw patterns are not available on this page. To narrow by fuel, space and size, use the water heater selector.
DOE CCD · 2026-09-19