The Caleffi R39204 is a STD PLASTIC CHECK VALVE INSERT NV20 DN20 for Caleffi mixing valve systems. It is supplied as a service or integration component and is not a standalone mixing valve.
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
Thermostatic Element Control
A wax-actuated element responds to outlet temperature changes and repositions the shuttle continuously, holding setpoint without power or controls.
Integral Check Valves
Inlet port check valves are built in, preventing crossflow between hot and cold supplies without additional fittings.
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
| Series | Accessories |
| Valve Technology | Thermostatic |
Related Products
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- Caleffi F0000962 : Replacement LEGIOMIX controller
- Caleffi F69591 : Replacement recirculation sensor
Frequently Asked Questions
Does Caleffi R39204 include check valves?
Yes. This model includes integral inlet port check valves, which prevent crossflow between the hot and cold supplies. The C in the product code identifies models supplied with integral check valves.
What is the warranty on Caleffi R39204?
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:
- Accessories
- Valve Technology:
- Thermostatic
- Application:
- Point of Distribution
- Integral Check Valves:
- Yes
- Temperature Gauge:
- No
