Cross Over Valve Kit

RTG20285 Crossover Valve Kit – Thermostatic Recirculation Valve for Retrofit Installations

The Rheem RTG20285 Cross Over Valve Kit is designed to enable recirculation in hot water systems where dedicated return lines are not present. Installed at the fixture furthest from the water heater, typically under a sink, this thermostatically controlled valve allows cold water lines to act as a temporary return path during pump operation, significantly reducing hot water delivery times.

This component is suitable for use in residential retrofit applications where plumbing modifications are limited. It is compatible with recirculation-enabled Rheem tankless water heaters and is part of Rheem’s integrated comfort delivery systems.

Primary Function

• Type: Thermostatic crossover valve
• Operation: Opens below ~95°F to allow return flow; closes automatically at approximately 105°F to maintain hot water availability at the fixture
• Placement: At the furthest fixture (typically under a lavatory or kitchen sink)

System Compatibility

• Compatible with Rheem tankless gas water heaters equipped with recirculation programming
• Can be paired with an external recirculation pump where a dedicated return line is not installed

Included Components

• Crossover valve body with integrated thermostatic element
• Supply line fittings
• Mounting and installation hardware

Installation Overview

The RTG20285 is intended for under-sink installation at the terminal fixture. Installation requires cold and hot water shutoff, connection to the angle stops or supply lines, and secure attachment of the valve to existing piping. No electrical wiring is required. This product should be installed by a qualified plumber to ensure correct operation and compliance with code requirements.

Incorrect installation may result in poor circulation performance, premature valve failure, or unexpected temperature swings.

Use Case Scenarios

• Residential homes without dedicated hot water return piping
• Retrofit solutions for existing tankless systems
• Improving hot water response time at distant fixtures

Performance Notes

• Valve opens automatically when hot water drops below set temperature threshold (~95°F)
• Closes once threshold (~105°F) is reached, maintaining hot water at the fixture and preventing continuous loop operation
• Reduces water waste and improves user comfort without requiring structural plumbing changes

Additional Considerations

• May require multiple valves in large homes with multiple remote fixtures
• System performance depends on pump flow rate and heater recirculation settings
• Do not install in systems with dedicated return piping