GL-235 is America's best-selling solar control and is designed for easy and dependable operation. Its microprocessor-based technology ensures reliable and accurate performance. Advanced features include differential temperature control, selectable high limit, programmable recirculation freeze protection, nocturnal cooling, and optional booster pump control.

• UL-approved
• Recirculation freeze protection
• Automatically maximizes solar heat collection
• LED indicators show status of system operations
• Precise, easy-to-read, calibrated temperature setting
• Electronics in UV-protected locking weatherproof enclosure
• Single-setting adjustment for desired pool/spa temperature
• Installer-programmable features for any-system adaptability
• Automatic switching (selectable) from solar pool heating to nocturnal pool cooling