OSHA's Nationally Recognized Testing Laboratory (NRTL ...
2021-9-2 · Gas Water Heaters - Volume III - Storage, Circulating and Instantaneous Water Heaters with Input Ratings above 75,000 Btu per Hour or less: CSA/AM Z21.11.2: Gas-Fired Room Heaters - Volume II - Unvented Room Heaters: CSA/AM Z21.13: Gas-Fired Low-Pressure Steam and Hot Water Heating Boilers: CSA/AM Z21.15: Manually Operated Gas Valves: CSA/AM Z21.17
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