Historical
ANSI Z21.13-2004/CSA 4.9-2004
Gas-Fired Low Pressure Steam and Hot Water Boilers
This standard applies to newly produced gas-fired low-pressure steam and hot water boilers with gas inlet pressure ratings not exceeding 1/2 psi (3.5 kPa) and having input ratings of less than 12,500,000 Btu per hour (3 663 389 W).
Content Provider
CSA America, Inc. [csa]