Hot Water Thermal Disinfection
Thermal disinfection water management strategies periodically raise water temperatures throughout a DHW system to help mitigate Legionella and other waterborne bacteria growth.
The CSUTD-D provides thermostatic balancing during normal operation while supporting the elevated water temperatures used during scheduled thermal disinfection cycles.
Key Advantages
- Reduces Balancing Labor and Callbacks – Self-actuating operation eliminates manual balancing and readjustment as system conditions change.
- Direct Replacement for Manual Balancing Valves – Converts manual balancing to automatic temperature-based control.
- Resists Debris Buildup – Two high-thrust thermal actuators help keep the valve orifices free of debris.
- Built for Long-Term DHW Service – Corrosion-resistant stainless-steel construction and a 10-year warranty support long service life.
Typical Applications
The CSUTD-D is designed for commercial domestic hot water recirculation systems that incorporate scheduled thermal disinfection cycles. Typical installations include hospitals and healthcare facilities, hotels, schools, high-rise buildings, and multifamily properties.
To see CircuitSolver® installations in your area, visit our installations page.
CircuitSolver® Thermal Disinfection Resources
Product Literature
Specification & Installation
Design Files
Technical Specifications
| Description | Specification* |
|---|---|
| Valve Sizes | ½” , ¾”, & 1” NPT |
| Fixed Set Points | 60°F, 65°F, and 70°F (15.6°C, 18.3°C, and 21.1°C) |
| Maximum Working Pressure | 200 PSIG (14 bar) |
| Maximum Working Temperature | 250°F (121°C) |
| Valve Construction | 300-series stainless steel |
| Union Seal | Buna-N O-ring |
| Check Valve | Glass-Filled Noryl |
| Isolation Ball Valves | Lead-free brass |
| Connection Options | Viega® ProPress® and Uponor ProPEX® |
| Thermometer Range | 50°F to 300°F (10°C to 149°C) |
*Configuration and option availability varies by valve size and assembly. Consult the factory if a different high temperature is required.
Certifications & Compliance
- NSF/ANSI/CAN 61 & 372 Certified
- Buy America Act / BABAA compliance
- Compliant with Section 1417(d) of the Safe Drinking Water Act (SDWA)
- Supports efforts toward LEED Certification
How the Thermal Disinfection Balancing Valve Works
Normal Balancing
During normal DHW operation, the valve remains open as the branch or riser warms. The valve is fully open approximately 10°F below its closing temperature. As water approaches the factory-set balancing temperature, the low-temperature actuator modulates towards its closed position, directing flow to branches that have not yet reached temperature.
Thermal Disinfection
When system temperature increases for a scheduled thermal disinfection cycle, the low-temperature actuator reopens the valve, allowing elevated-temperature water to circulate through the branch or riser.
High-Temperature Control
When water reaches the factory-set thermal disinfection temperature, the second high-temperature actuator modulates the valve toward its closed position.
A small bypass flow remains to prevent dead-heading the recirculation pump.
CircuitSolver® Thermal Disinfection Configurations
Valve Configurations
| Configuration | Includes | Installation Benefit |
|---|---|---|
| CircuitSolver® Union Thermal Disinfection Dual (CSUTD-D) | Two thermal actuators, an integrated union with O-ring, and optional check valve | Integrated union simplifies installation and valve removal for service. |
| CircuitSolver® Union Thermal Disinfection Dual Assembly (CSUATD-D) | Two thermal actuators, a union with O-ring, optional check valve, and isolation ball valves | Factory-assembled package reduces field-installed components and labor. |
| CircuitSolver® Union Thermal Disinfection Dual Assembly with Strainer (CSUASTD-D) | Two thermal actuators, a union with O-ring, optional check valve, isolation ball valves, and integrated #20-mesh strainer | Adds particulate protection while reducing field-installed components. |
Connection & Monitoring Options
Viega® ProPress® Connections
Available on any CircuitSolver® thermal disinfection configuration for integration into ProPress piping systems. Viega® Smart Connect Technology helps identify unpressed connections, supporting faster installation and system startup.
Uponor ProPEX® Connections
Available on any CircuitSolver® thermal disinfection configuration for installations using ProPEX® expansion-type PEX piping. ProPEX connections reduce the number of piping connections and eliminate the need for torches, glues, gauges, solder, or calibration during installation.
Thermometer Assembly
Provides an easy-to-read dial for in-line temperature verification. The assembly can be integrated with any CircuitSolver® thermal disinfection configuration or purchased separately for new or existing installations. Measures water temperatures from 50°F to 300°F (10°C to 149°C).
Integrated connection and monitoring configurations are assembled and tested before shipment to reduce field assembly requirements.
Build Your CircuitSolver® Thermal Disinfection Model
Select the valve configuration, line size, temperature set point, and applicable connection or accessory options to build the model number.
