The Caleffi 600066A is a LEGIOMIX electronic mixing valve with 1" Press connections and rated 21 Cv. It is used for point of distribution temperature control in domestic hot water and hydronic systems.
Best for water heater and storage tank outlets where a single valve sets the distribution temperature for an entire building, zone or riser.
Specifications sourced from Caleffi NA technical literature, 2025 revisions.
Key Features
Programmable Thermal Disinfection
Scheduled high-temperature disinfection cycles help manage Legionella risk in domestic hot water systems, with logged cycle verification.
BACnet and Modbus Ready
Integrates directly with building automation for setpoint control, alarm reporting and cycle logging.
Low-Lead Brass Construction
Wetted surfaces carry a weighted average lead content below 0.25%, meeting Section 1417 of the Safe Drinking Water Act.
Fast Mechanical Connection
Press tailpieces cut installation time and remove open flame from the job site.
Technical Specifications
| Connection Size | 1" |
| Connection Type | Press |
| Flow Coefficient (Cv) | 21 |
| Maximum operating pressure | 150 psi |
| Maximum static operating pressure | 230 psi |
| Adjustment temperature range | 70-185 deg F |
| Maximum inlet temperature | 212 deg F |
| Disinfection temperature range | 100-185 deg F |
| Electric supply | 24 V AC |
| Power consumption at full capacity | 6 VA |
| Protection class | IP 54 |
| Series | LEGIOMIX |
| Valve Technology | Electronic |
| Shipping Weight | 7.3 lb |
Documentation
Design Resources
Related Products
- Caleffi 600064A : LEGIOMIX Electronic Mixing Valve 1" NPT
- Caleffi 600064A 001 : LEGIOMIX Electronic Mixing Valve 1" NPT
- Caleffi 600066A 001 : LEGIOMIX Electronic Mixing Valve 1" Press
- Caleffi 600069A : LEGIOMIX Electronic Mixing Valve 1" Sweat
Frequently Asked Questions
What is the temperature adjustment range of Caleffi 600066A?
The adjustment temperature range is 70-185 deg F. Maximum inlet temperature is 212 deg F. Confirm the setpoint against the applicable plumbing code for the installation.
What connection does Caleffi 600066A use?
Caleffi 600066A is supplied with 1" Press connections. Other connection styles in the LEGIOMIX family are listed under Related Products.
Does Caleffi 600066A include integral check valves?
No. This model is supplied without integral inlet check valves. Caleffi offers a companion model with a C in the product code for applications that require built-in crossflow protection.
What is the warranty on Caleffi 600066A?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of purchase. ZOT Supply is an authorized Caleffi distributor.
- Product Series:
- LEGIOMIX
- Valve Technology:
- Electronic
- Application:
- Point of Distribution
- Connection Type:
- Press
- Connection Size:
- 1 inch
- Flow Coefficient:
- 21 Cv
- Integral Check Valves:
- No
- Temperature Gauge:
- No
- Adjustment Temperature Range:
- 70-185 deg F