Are you considering installing an instantaneous electric water heater in your new single-family dwelling unit? If so, we have some exciting news for you! The Title 24 code, has undergone a significant change, now allowing for the installation of electric instantaneous water heaters (i.e., tankless electric water heaters) with point-of-use distribution systems in new dwelling units of up to 500 square feet of conditioned floor area.
As we have previously written, prior to this change, instantaneous electric water heaters were not deemed feasible in single-family residential units. However, Section 5.4.1 of the Single Family Residential Compliance Manual now permits such installations as noted below:
An electric instantaneous water heater with point-of-use distribution (RA4.4.5|topic=RA4.4.5 Point of Use (POU)) is allowed in new dwelling units of up to 500 ft2 conditioned floor area
Source: 2022 California Single Family Residential Compliance Manual
Point-of-Use Distribution Systems
A point-of-use distribution system design involves the installation of a water heater adjacent to hot water use points. An indoor mechanical closet may be used, or multiple water heaters may be installed close to the use points. Figure 5-10, reproduced below, provides an example of the latter approach, where three water heaters are installed close to the use points.
To comply with the installation guidelines, all applicable mandatory requirements must be met, and the distance between the water heater and any fixture using hot water cannot exceed the values specified in Table 5-10, reproduced below.
Piping Size, Nominal, Inches | Maximum Length of Pipe between Water Heater and any Fixture using Hot Water (Feet) |
3/8" | 15 |
1/2" | 10 |
3/4" | 5 |
The adopted requirements for installation guidelines are included in RA3 and RA4, and all water heaters and hot water fixtures must be shown on plans submitted for a local building department plan check.
This change in Title 24 code is great news for single-family residential units in California, especially new ADUs, as it offers homeowners more options for energy-efficient water heating solutions. The installation of instantaneous electric water heaters with point-of-use distribution systems will not only help homeowners save money on energy bills but will also reduce water waste.
So, if you are building a new single-family residential unit in California and are considering an electric instantaneous water heater with a point-of-use distribution system, rest assured that you can now do so in compliance with the Title 24 code. With the right architectural design and proper installation, you can enjoy an energy-efficient and cost-effective hot water supply in your home.
Achieving compliance with Title 24 can seem like a daunting task - by working with a qualified professional, you can ensure that your project meets all of the necessary requirements for compliance. C&S Energy Pro is committed to getting a fast turnaround on your Title 24 documents which will help ensure construction projects are completed on time and that consumers will be able to move into their homes quicker. Avoid the hassle of long wait times generally associated with Title 24 documentation and call us today!
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