The GL-235 is America's best-selling solar control 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.

Features
• Automatically maximizes solar heat collection by actuating a 24V valve when there is solar heat available
• LED indicators show status of system operations
• Automatic switching (selectable) from solar pool heating to nocturnal pool cooling
• Single-setting adjustment for desired pool/spa temperature
• Recirculation freeze protection
• Installer-programmable features for any-system adaptability
• Quick, accurate, easy-to-set desired temperature controls
• Easy to read, understand and operate