Los Angeles Municipal Code § 94.610 Water Supply and Distribution

Hot Water Delivery. Hot water systems shall comply with LAMC Subdivisions 94.610.4.1.1, 94.610.4.1.2 or 94.610.4.1.3.

EXCEPTIONS:

1. Multi-family buildings where each unit is submetered and where the building has a central hot water heating system.

2. Additions that are supplied by any portion of the existing water heating system.

3. Alterations that do not include replacing all of the potable water piping.

Where a hot water recirculation or electric resistance heat trace wire system is installed, the branch from the recirculating loop or electric resistance heat trace wire to the fixture shall contain a maximum of

0.6 gallons. Hot water recirculation systems may include, but are not limited to, the following:

1. Timer-initiated systems.

2. Temperature sensor-initiated systems.

3. Occupancy sensor-initiated systems.

4. Smart hot water recirculation systems.

5. Other systems acceptable to the Department.

Residential units having individual water heaters shall have a compact hot water system that meets all of the following:

1. The hot water supply piping from the water heater to the fixtures shall take the most direct path;

   2. The total developed length of pipe from the water heater to the farthest fixture shall not exceed the distances specified in Table 3.6.5 of the 2019 California Energy Code Residential Appendix; and

   3. The hot water supply piping shall be installed and insulated in accordance with Section RA3.6.2 of the 2019 California Energy Code Residential Appendix.