The Caleffi 520051A is a replacement mixing valve body, supplied without union tailpieces or fittings. It replaces the body in an existing installation, reusing the connections already in place, and is not a complete valve assembly.
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 North America document 01267_NA. Last reviewed August 2026.
Key Features
ASSE 1017 Listed
Certified for point-of-distribution service, controlling water heater outlet temperature for an entire building or zone.
Thermostatic Element Control
A wax-actuated element responds to outlet temperature changes and repositions the shuttle continuously, holding setpoint without power or controls.
Low-Lead Brass Construction
Wetted surfaces carry a weighted average lead content below 0.25%, meeting Section 1417 of the Safe Drinking Water Act.
Technical Specifications
| Certification | ASSE 1017 |
| Series | Accessories |
| Valve Technology | Thermostatic |
| Shipping Weight | 1.8 lb (approx.) |
Documentation
Design Resources
Related Products
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- Caleffi F0000962 : Replacement LEGIOMIX controller
- Caleffi F69591 : Replacement recirculation sensor
Frequently Asked Questions
Is Caleffi 520051A approved for point-of-distribution service?
Yes. Caleffi 520051A is listed to ASSE 1017, the standard covering temperature-actuated mixing valves used to control hot water distribution from a water heater or storage tank. ASSE 1017 valves regulate system supply temperature; they are not a substitute for ASSE 1070 point-of-use scald protection at individual fixtures.
Does Caleffi 520051A 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 520051A?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.
- Product Series:
- Replacement Body
- Valve Technology:
- Thermostatic
- Application:
- Point of Distribution
- ASSE Listing:
- ASSE 1017
- Integral Check Valves:
- No
- Temperature Gauge:
- No
