The Caleffi 6686N5S1A is a TwistFlow pre-assembled radiant distribution manifold with 12 loops and a 1 in trunk, distributing and balancing heating fluid to each circuit of a radiant floor or panel system with built-in per-loop flow gauges.
Product data compiled from Caleffi North America technical documentation. Last reviewed July 2026.
Key Features
Pre-Assembled & Tested
Ships fully assembled with supply and return manifolds, ready to connect to radiant loops.
Per-Loop Flow Balancing
Each circuit has a built-in sight flow gauge / balancing valve for precise, visible flow setting.
Integral Shut-Off & Venting
Individual loop shut-off plus air venting and automatic air removal built into the manifold.
12-Loop Configuration
Distributes flow across 12 independent radiant circuits.
Technical Data
| Function | Pre-assembled radiant distribution manifold |
|---|---|
| Number of outlets | 12 ports |
| Manifold connection | 1 in |
| Maximum operating pressure | 150 psi |
| Medium temperature range | 32-180 °F |
| Flow meter scale | 1/4-2 gpm |
| Outlet center distance | 2 in |
Documentation
Technical brochureRelated Products
Frequently Asked Questions
It is a TwistFlow pre-assembled distribution manifold with 12 loops for radiant floor and panel heating systems, distributing and balancing flow to each circuit.
Each circuit has a built-in sight flow gauge and balancing valve, so per-loop flow rate can be set and verified visually.
12 independent radiant circuits.
- Type:
- Radiant Manifold
- Series:
- TwistFlow
- Number of Ports:
- 12
- Configuration:
- Standard
- Connection Size:
- 1 in
