Rheem RHE40S
Rheem RHE40S is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 40 gallons, a certified storage volume of 37 gallons, a certified UEF of 0.83, and a certified first-hour rating of 87 gallons of hot water.
- Gas storage water heater
- 2 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Certified figures
- Storage volume
- 37gallons
- UEF
- 0.83Uniform energy factor
- First-hour rating
- 87gallonsHot 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 |
|---|---|---|---|---|---|
| CNRHE40S | 37 | 0.83 | 87 | 92% | High |
| RHE40S | 37 | 0.83 | 87 | 92% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 37 gallons in the test, 3 gallons less than its 40-gallon sold size. Over one hour from a full tank, it gave 87 gallons in the test (its first-hour rating). Its tank holds 37 gallons, so reheating adds 50 gallons during the first hour. Among 763 gas storage models, 143 have a higher first-hour rating. Among gas storage models, the median first-hour rating is 78 gallons.
It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 83% of the energy went to hot water, so its UEF is 0.83. The daily hot water use in the test, called its draw pattern, was high. Its UEF is lower than that of 46 of the 434 gas storage models with its draw pattern. For its type and draw pattern, the UEF runs from 0.61 to 0.90. When it reheats water in the test, 92% of the energy it uses ends up in the water.
It is sold as CNRHE40S and RHE40S. All of its test figures are shared by 3 other basic models. Of those, one or more are under the ECOSENSE, Richmond, and Ruud brands.
It may qualify for 2 rebate programs in 2 states.
Also listed as
They carry every figure in the table above.
Rebates
| Program | State | Status | Program page |
|---|---|---|---|
| Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless) | MN | May qualify | Its own page |
| Avista Home and small commercial: HVAC and water heating incentives (gas storage) | WA | May qualify | Its own page |
Programs change their terms. Check the program's own page before you buy.
- Every Rheem basic model
- Every 40-gallon gas storage water heater
- Every gas storage water heater
- The most-searched gas storage models side by side
Not covered
- Advertised figures. We have none on file for this model.