HEAT-FLO SSL-20S
HEAT-FLO SSL-20S is in the DOE listing as of Oct 26, 2026.
It has a certified storage volume of 23 gallons, a certified UEF of 0.92, and a certified first-hour rating of 33 gallons of hot water.
- Electric storage water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 23gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 33gallonsHot water in the first hour
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Change your hourCertified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| SSL-20S | 23 | 0.92 | 33 | 98% | Low |
UEF is the uniform energy factor. A dash means the model has no such figure.
Starting full, it gives 33 gallons of hot water in its first hour of use. That is 10 gallons more than its tank holds, since it reheats during the hour. Among 477 electric storage models, 474 have a higher first-hour rating. The median electric storage model gives 55 gallons in its first hour.
In tests, 92% of the energy it uses ends up as hot water (UEF 0.92). The daily hot water use in the test, called its draw pattern, was low. Its UEF is lower than that of 12 of the 157 electric storage models with its draw pattern. On its draw pattern, its UEF is also the median electric storage UEF. The water took in 98% of the energy used to reheat it (its recovery efficiency).
Not covered
- Advertised figures. We have none on file for this model.