LOCHINVAR ENS-40W 1**
0.88 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 163 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, low draw pattern (a one- or two-person household).
You are checking the LOCHINVAR ENS-40W 1**, an electric tank. At the federal test's daily hot-water draw, it uses 2,550 kWh of electricity a year. That figure applies to the low draw pattern, the standard daily hot-water usage DOE tests against. It sits 111 kWh above the median of 2,439 kWh for its class.
Energy use per year
2,550 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 above the median of 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 158 of 163, lowest energy first.
Solid line: this model (2,550 kWh). Dashed line: the class median.
Min 724 kWh Median 2,439 kWh Max 2,550 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
- 0.88 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the low draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Low 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
- 41 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
Not published: Installed cost range
This model's UEF lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety 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
-
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.
-
Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
-
What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
-
Is a 40-gallon water heater enough?
Answered from what models in this size actually file.
-
Water heaters
Every model on file with the Department of Energy, by heater type.
-
All electric resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
-
Every LOCHINVAR model on file
What this brand files, by heater type.
UEF 0.88 · Grade G Price it on your ZIP
The 2,550 kWh figure comes from this site's calculation. The registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.88 with the DOE test's daily hot-water draw for the low draw pattern. The source is the DOE CCD, retrieved 2026-09-19. This model is compared with the 163 models registered as an electric tank at the low draw pattern. At that same test draw, their median is 2,439 kWh a year. Ranked from lowest energy use, this model is 158th of 163. The page on how the annual cost is calculated sets out the method behind these figures.
Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 41 gallons. The rated volume is 37 gallons. The 2,550 kWh figure holds only for a household whose daily hot-water use matches the low draw pattern. A household that draws more hot water each day would use more energy than that figure. This page has no figure for heavier use, so that amount is not available here. A household that needs more than 41 gallons in the first hour from a full tank is outside what this rating covers. The selector by fuel, space and size filters models on those limits.
The text on this page gives no running cost. What 2,550 kWh of electricity a year costs depends on your own utility tariff. The cost calculator on your own ZIP works that cost out from your ZIP code. The same tariff sets what the 111 kWh gap above the class median of 2,439 kWh costs you each year. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare models in the same class, find a same-class replacement by model number.
DOE CCD · 2026-09-19