Lochinvar GPVT-40 2** vs Rheem RHE40S: which uses less energy?
An asterisk in a model number stands for any character: one filing covers several variants.
At the high draw pattern the Rheem RHE40S uses 204 therms a year and the Lochinvar GPVT-40 2** 242 — 38 therms (16%) less, about 379 therms over ten years. Both are filed as a gas tank, so the comparison holds. Enter your ZIP below to price the difference.
Side by side
Compared within one class only: models filed as a gas tank at the high draw pattern.
| Figure | Lochinvar GPVT-40 2** | Rheem RHE40S |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.7 | 0.83 (better) |
| Energy use per year (therms) | 242 | 204 (better) |
| First hour rating (gal) | 87 | 87 |
| Rated storage volume (gal) | 38 | 37 |
| Installed cost range NLR REMDB | $1,993–$3,665 | not published |
| 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 Rheem RHE40S if running cost matters most: it uses 38 therms less a year on the same test.
- Pick the Lochinvar GPVT-40 2** if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the Rheem RHE40S.
- Neither if your household's busiest hour needs more than 87 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.
Each model on its own
- Lochinvar GPVT-40 2** 242 therms a year
- Rheem RHE40S 204 therms a year