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M2005.1 General
Water heaters shall be installed in accordance with Chapter 28, the manufacturer's instructions and the requirements of this code. Water heaters installed in an attic shall comply with the requirements of Section M1305.1.2. Gas-fired water heaters shall comply with the requirements in Chapter 24. Domestic electric water heaters shall comply with UL 174. Oiled-fired water heaters shall comply with UL 732. Solar thermal water heating systems shall comply with Chapter 23 and ICC 900/SRCC 300. Solid fuel-fired water heaters shall comply with UL 2523.
M2005.2 Prohibited Locations
Fuel-fired water heaters shall not be installed in a room used as a storage closet. Water heaters located in a bedroom or bathroom shall be installed in a sealed enclosure so that combustion air will not be taken from the living space. Installation of direct-vent water heaters within an enclosure is not required.
M2005.2.1 Water Heater Access
Access to water heaters that are located in an attic or underfloor crawl space is permitted to be through a closet located in a sleeping room or bathroom where ventilation of those spaces is in accordance with this code.
M2005.3 Electric Water Heaters
Electric water heaters shall be installed in accordance with the applicable provisions of Chapters 34 through 43.
M2005.4 Supplemental Water-Heating Devices
Potable water-heating devices that use refrigerant-to-water heat exchangers shall be approved and installed in accordance with the manufacturer's instructions.

Related Code Sections

Section 1002 Boilers, Water Heaters and Pressure Vessels, Water Heaters
Potable water heaters and hot water storage tanks shall be listed and labeled and installed in accordance with the manufacturer's instructions ...
Section 1002 Boilers, Water Heaters and Pressure Vessels, Water Heaters
Potable water heaters and hot water storage tanks shall be listed and labeled and installed in accordance with the manufacturer's instructions ...
Section 1002 Boilers, Water Heaters and Pressure Vessels, Water Heaters
Potable water heaters and hot water storage tanks shall be listed and labeled and installed in accordance with the manufacturer's instructions ...
Chapter 28 Water Heaters
covers the access requirements to water heaters and hot water storage tanks to allow for the maintenance and replacement of that equipment. Code ...
Chapter 28 Water Heaters
covers the access requirements to water heaters and hot water storage tanks to allow for the maintenance and replacement of that equipment. Code ...