This Standard applies to newly produced gas-fired low-pressure steam and hot water boilers with gas inlet pressure ratings not exceeding 0.5 psi (3.5 kPa) and having input ratings of less than 12,50000 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.
