A. O. Smith GDVNL-40L 1** vs American Standard GSN40L2-3-*: 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 GDVNL-40L 1** uses 182 therms a year and the American Standard GSN40L2-3-* 185 — 3 therms (2%) less, about 30 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 medium draw pattern.
| Figure | A. O. Smith GDVNL-40L 1** | American Standard GSN40L2-3-* |
|---|---|---|
| UEF (Uniform Energy Factor) | 0.61 (better) | 0.6 |
| Energy use per year (therms) | 182 (better) | 185 |
| First hour rating (gal) | 64 | 64 |
| Rated storage volume (gal) | 38 | 38 |
| Installed cost range NLR REMDB | $1,468–$2,313 | $1,410–$2,162 |
| CPSC recall naming it CPSC | none on file (better) | recall 16171 |
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.
- The American Standard GSN40L2-3-* is named in CPSC recall 16171; see the recall page for which units and the remedy.
- The actual warranty term is printed in each model’s documentation, not in any registry.
Which should you pick?
- Pick the A. O. Smith GDVNL-40L 1** if running cost matters most: it uses 3 therms less a year on the same test.
- Pick the American Standard GSN40L2-3-* if the installed price matters more than the running cost: its modeled installed range is $1,410–$2,162 against $1,468–$2,313.
- Neither if your household's busiest hour needs more than 64 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.
Each model on its own
- A. O. Smith GDVNL-40L 1** 182 therms a year
- American Standard GSN40L2-3-* 185 therms a year