scope:

This standard applies to newly produced gas-fired low-pressure steam and hot water boilers with gas inlet pressure ratings not exceeding ½ psi (3.5 kPa) and having input ratings of less than 12,500,000 Btu/hr (3 663 389 W) (see Clause 3), hereinafter referred to as boilers*, constructed entirely of new unused parts and materials, for operation at or below the following pressures and temperatures:

Steam heating boilers

15 psi (103.42 kPa) steam pressure

Hot water heating boilers

160 psi (1.10 MPa) water pressure

250°F (121°C) water temperature

Hot water supply boilers

160 psi (1.10 MPa) water pressure

250°F (121°C) water temperature

a) For use with natural gas;

b) For use with manufactured gas;

c) For use with mixed gas;

d) For use with liquefied petroleum gases; and

e) For use with LP gas-air mixtures.