ICC 900/ SRCC 300-2026 Solar Thermal System Standard

The ICC 900/SRCC 300 Solar Thermal System Standard establishes comprehensive minimum criteria for the design, evaluation, testing and documentation of solar thermal systems used to heat water. Developed to support safe, durable and code-compliant installations, this standard provides clear technical requirements and delivers a consistent framework for manufacturers, testing laboratories, code officials and industry professionals to evaluate solar thermal systems with confidence and clarity.

This standard reflects current technologies, including photovoltaic water heating systems and photovoltaic-thermal hybrid (PVT) collectors, while maintaining strong safeguards for potable water protection, occupant safety and structural durability

This book includes:

• Minimum design criteria for active, passive, thermosiphon, drainback and PV water heating systems
• Detailed requirements for temperature resistance, stagnation tolerance, freeze protection and pressure control
• Material performance provisions and strict criteria for approved heat transfer fluids
• Environmental durability testing based on ISO 9806
• Requirements for double-wall heat exchangers and cross-connection control safeguards, and electrical component compliance aligned with NFPA 70 and applicable UL/CSA standards