A. O. Smith GCRH-40 4** vs Rheem PROG40-34N RH62 MH: which uses less energy?
An asterisk in a model number stands for any character: one filing covers several variants.
At the medium draw pattern the A. O. Smith GCRH-40 4** and the Rheem PROG40-34N RH62 MH use the same energy, 188 therms a year each, on the same federal test. Both are filed as a gas tank, so the comparison holds; what separates them is below. Enter your ZIP to price either one on your own rate.
Side by side
Compared within one class only: models filed as a gas tank at the medium draw pattern.
| Figure | A. O. Smith GCRH-40 4** | Rheem PROG40-34N RH62 MH |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.59 | 0.59 |
| Energy use per year (therms) | 188 | 188 |
| First hour rating (gal) | 65 | 57 |
| Rated storage volume (gal) | 38 | 38 |
| Installed cost range NLR REMDB | $1,351–$2,012 | $1,351–$2,012 |
| CPSC recall naming it CPSC | none on file | none on file |
DOE CCD · 2026-09-19 NLR REMDB · 2026-04-01 CPSC · 2026-09-24
What it costs to run
Reliability
Not published: Reliability, failure rates and each model’s actual warranty term.
The registries these figures come from certify energy performance under a federal test; none of them records how long a unit lasts or how often it fails, so this page does not rank the two on reliability.
What is here instead:
- The filed efficiency, capacity and tank size of both models, side by side above.
- No CPSC recall on file names either model (list checked 2026-09-24).
- The actual warranty term is printed in each model’s documentation, not in any registry.
Which should you pick?
- Pick the A. O. Smith GCRH-40 4** if you need more hot water in your busiest hour: it lists a first hour rating of 65 gallons against 57.
- Neither if your household's busiest hour needs more than 65 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.
Each model on its own
- A. O. Smith GCRH-40 4** 188 therms a year
- Rheem PROG40-34N RH62 MH 188 therms a year