HEAT-FLO SSL-20S
0.92 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).
HEAT-FLO SSL-20S uses 2,439 kWh of electricity a year at the low draw pattern, the standard daily hot-water usage DOE tests against. That pattern represents a one- or two-person household. The class median is 2,439 kWh, a difference of 0 kWh, and the model ranks 19th lowest of 163.
Energy use per year
2,439 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 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 19 of 163, lowest energy first.
Solid line: this model (2,439 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
- 0.92 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
- 33 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 23 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's rated tank size 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
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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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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.
UEF 0.92 · Grade G Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.92 for this model. This site combined that UEF with the DOE test's daily hot-water draw for the low draw pattern. The registry does not publish the annual energy figure itself. The result is 2,439 kWh, from DOE CCD data retrieved on 2026-09-19. That figure holds only at the federal test's daily draw. It equals the class median of 2,439 kWh, a difference of 0 kWh. Its rank of 19th lowest of 163 models still places it in the lowest quarter of its class. The data does not show how many models share this value. How the annual cost is calculated is explained on the methodology page.
The low draw pattern describes a one- or two-person household. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 33 gallons. The rated volume is 23 gallons. The energy figure of 2,439 kWh applies at the low draw pattern only. A household with heavier hot-water use falls under a different draw pattern, so that figure does not describe it. The data here does not say whether a first hour rating of 33 gallons covers a given household's peak demand. To compare by fuel, space and size, use the water heater selector.
The running cost is not stated in the text. It depends on your own utility electricity tariff, and this page does not estimate it. You can multiply 2,439 kWh by your rate per kilowatt-hour, or enter your ZIP in the cost calculator. The installed price range is not published for HEAT-FLO SSL-20S. Its ratings lie outside the range the cost database's model was fitted on, and that range is not stretched past its limit. The rank of 19th lowest of 163 models refers to energy use only and says nothing about price. To look for a same-class replacement, search by model number.
DOE CCD · 2026-09-19