# ANSI Z21.10.3 — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For ANSI Z21.10.3, laboratory is TÜV SÜD America Inc; standard title is Gas-Fired Water Heaters - Volume III, Storage Water Heaters With Input Ratings Above 75,000 BTU Per Hour, Circulating and Instantaneous, verified against its source on 2026-08-10.

- **Laboratory:** TÜV SÜD America Inc. _(verified: appears in the quote below)_
- **Standard number:** ANSI Z21.10.3 _(verified: appears in the quote below)_
- **Standard title:** Gas-Fired Water Heaters - Volume III, Storage Water Heaters With Input Ratings Above 75,000 BTU Per Hour, Circulating and Instantaneous _(verified: appears in the quote below)_

## What the source says

> ANSI Z21.10.3 | Gas-Fired Water Heaters - Volume III, Storage Water Heaters With Input Ratings Above 75,000 BTU Per Hour, Circulating and Instantaneous |

## Source

- https://www.osha.gov/nationally-recognized-testing-laboratory-program/tuvam

Last verified: 2026-08-10. Review by: 2026-12-08.
Part of [Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced](https://referencesource.org/nrtl-recognition-scopes/).