Mechanical code regulated boilers and water heaters

Includes electric, gas-fired, oil-fired, and solid-fuel fired equipment.

Water heaters

General information about fuel-fired tank-type water heaters

Electric domestic (household) storage tank (UL 174) Information Manufacturers

Electric tankless (UL 499) Information Manufacturers

Electric commercial storage tank (UL 1453) Information Manufacturers

Gas-fired with input above 75,000 Btu per hour (ANSI Z.21.10.3) Information Manufacturers

Gas-fired with input 75,000 Btu per hour or less (ANSI Z.21.10.1/CSA 4.1)  Information Manufacturers

Gas-fired, commercial and industrial (UL 795) Information Manufacturers

Gas-oil-fired (UL 732 and UL 795) Information Manufacturers

Multi-energy (UL 732, UL 795, UL 391, UL 1453, UL 174, ANSI Z21.10.1, and ANSI Z21.10.3) Information Manufacturers

Oil-fired (UL 732) Information Manufacturers

Solar (UL 174 and UL 1453) Information Manufacturers

Solid-fuel-fired (UL 2523) Information Manufacturers

Space heating (UL 834) Information Manufacturers

Evaluated to ANSI/NSF 5 (TSYO) Information Manufacturers

Boiler Assemblies and Systems

General information about fuel-fired boiler assemblies

Electric (UL 834) Information Manufacturers

Field-erected (UL 2106) Information Manufacturers

Gas-fired (UL 795) Information Manufacturers

Gas-fired low-pressure steam & hot water (ANSI Z21.13) Information Manufacturers

Gas-oil-fired (UL 726 and UL 795) Information Manufacturers

Oil-fired (UL 726) Information Manufacturers

Reduced emission boilers (UL 2096) Information Manufacturers

Solid fuel-fired (UL 726, UL 391) Information Manufacturers

Unitary boiler room systems (UL Subject 2446) Information Manufacturers

Waste-heat recovery (UL 726) Information Manufacturers