Product Overview

The Pentair SolarTouch® Solar Control System (Model 521592) delivers smart, automatic temperature-based control for pool solar heating systems. Designed to optimize energy use, SolarTouch senses the difference between solar panel and pool water temperatures and activates your solar valve only when solar heat is available—maximizing solar efficiency and ensuring consistent, comfortable water temperatures.

This complete control package includes a power center/control panel, a 3-way solar drain-down valve actuator, and two temperature sensors (20' water sensor and 40" rooftop solar sensor). It is fully compatible with Pentair variable-speed pumps, allowing the controller to automatically increase pump speed when solar heat is active.

Ideal For

• Pools using solar heating systems

• Homeowners looking to reduce heating costs using solar energy

• Systems requiring automatic valve control and temperature monitoring

• Installations with variable-speed pumps

• Pools needing drain-down protection for freeze prevention

Key Features

• Smart Solar Automation: Activates solar heating only when panel temperature is higher than pool temperature.

• Variable-Speed Pump Integration: Automatically increases pump RPM when solar is on, and reduces RPM when solar is off for optimum efficiency.

• 3-Way Solar Drain-Down Valve: Helps protect rooftop panels and plumbing in freeze-risk areas.

• Includes Two Temp Sensors:

  • 20 ft waterproof pool water sensor

  • 40" rooftop solar sensor

• Digital Control Panel: Clear display for temperature readings, status lights, and user settings.

• Energy Savings: Maximizes the free heat available from the sun, reducing need for gas or electric heating.

• Easy Installation: Pre-wired power center simplifies setup for both new and existing solar systems.

• Reliable Pentair Engineering: Designed for long-term outdoor performance.

Benefits

• Lower Heating Costs: Uses solar energy whenever possible to reduce reliance on traditional heaters.

• Consistent Water Temperature: Maintains comfortable pool temps without constant manual adjustments.

• Protects Solar Panels: Drain-down system prevents freeze damage during colder months.

• Improves Pump Efficiency: Smart coordination with variable-speed pumps saves electricity.

• Hands-Free Operation: Automatic temperature control and valve actuation simplify pool ownership.

Customer Q&A

Q: Does this system work with variable-speed pumps?
A: Yes. SolarTouch communicates with Pentair VS pumps to adjust speed when solar is activated.

Q: Does it include the temperature sensors?
A: Yes—both a 20 ft water sensor and a 40" solar sensor are included.

Q: Can this system control a gas heater?
A: SolarTouch is designed for solar heating control only. A separate controller is needed for gas heater management.

Q: Is the valve actuator included?
A: Yes. The package includes a solar 3-way drain-down valve component.

Q: Is this compatible with all solar panel types?
A: Yes. It works with most pool solar heating systems using a standard 3-way valve setup.

Specifications

• Model Number: 521592

• System Type: Solar Heating Control System

• Pump Compatibility: Pentair variable-speed pumps

• Included Components:

  • Power center/control panel

  • Solar 3-way drain-down valve

  • 20’ water temp sensor

  • 40” solar panel temp sensor

• Control Function: Turns solar heating on/off based on temperature differential

• Application: Residential in-ground pool solar heating

• Manufacturer: Pentair