The first Public Comment Period for the brand new “BSR/ICC 903/SRCC 500, Solar Tank Standard” is now available!

Public comments will be accepted from May 3, 2023 to July 3, 2023. Comments submission form and other details can be found at

Main Changes
Prior to this new standard, water heaters and storage tanks were typically certified to UL 174 (electrical type) and ANSI Z21.10.1 or ANSI Z21.10.3 (gas types). With the new standard, water heaters & water storage tanks to be used in a solar thermal system (including solar pool systems) will need to be certified to BSR/ICC 903/SRCC 500 in addition to either the UL or ANSI standards.

As one of the active members of the IS-STSC Committee, LabTest Certification can assist you with any questions you may have regarding the new standard requirements.

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