RELIANCE WATER HEATERS ENS-40 1**
0.92 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 426 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
You are verifying the RELIANCE WATER HEATERS ENS-40 1** at the medium draw pattern, the standard daily hot-water usage DOE tests against. At that pattern it uses 3,531 kWh of electricity a year, which is 0 kWh from its class median of 3,531 kWh. That ranks it 213th lowest in energy use of 426 comparable models.
Energy use per year
3,531 kWh 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 electricity rate where you live.
That is equal to the median of 3,531 kWh for the 426 models registered in the same heater type and draw pattern; it ranks 213 of 426, lowest energy first.
Solid line: this model (3,531 kWh). Dashed line: the class median.
Min 773 kWh Median 3,531 kWh Max 3,569 kWh
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
- 0.92 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium DOE CCD · 2026-09-19
- First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
- 55 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 37 gal DOE CCD · 2026-09-19
What it costs to install
$1,605–$1,828 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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Is a 40-gallon water heater enough?
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 electric resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
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Every RELIANCE WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The 3,531 kWh figure is computed by this site, not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw in the DOE test. For this model the UEF is 0.92, and the draw is the one DOE sets for the medium pattern. In plain terms, that pattern represents a typical mid-sized household with a busy morning of hot-water use. The UEF comes from the DOE CCD registry, retrieved 2026-09-19, and each step is set out in how the annual cost is calculated.
Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 55 gallons. The rated volume is 37 gallons, so the first hour rating exceeds the stated tank volume. A household whose busiest hour stays within 55 gallons of hot water falls inside what this rating describes. A household that regularly needs more than that in an hour falls outside the tested conditions, and this page has no figure for it. To compare other sizes or fuels, use the selector by fuel, space and size. If you need a like-for-like swap, you can find a same-class replacement by model number starting from ENS-40 1**.
This page does not state a yearly running cost in the text, because it depends on your own utility's electricity tariff. The page computes it from your ZIP, applying your local rate to the 3,531 kWh per year at the medium pattern. You can run the same step for any other ZIP with the cost calculator on your own ZIP. This model's energy use is 0 kWh from the class median. At any single rate, its running cost therefore matches that of a model at the class median. The installed price range appears in its own block with its source and date, as a modeled range rather than a quote. Actual household use that differs from the test draw would change both energy and cost, and those values are not available here.
DOE CCD · 2026-09-19