The Caleffi NA548120A is a Hydro Separator unit providing hydraulic separation, ASME Section VIII code stamped. It installs between the boiler circuit and the distribution circuits in hydronic heating and chilled water systems.
Best for decoupling boiler and system circuits where air and dirt separation are handled by other devices.
Specifications sourced from Caleffi NA technical literature, 2025 revisions.
Key Features
Primary/Secondary Decoupling
Hydraulically decouples boiler and system circuits so each pump sees only its own loop, eliminating flow interference without closely spaced tees.
Low-Velocity Separation Chamber
An enlarged internal chamber drops fluid velocity so entrained air rises and heavier particulate settles, both continuously removed in service.
ASME Code Stamped with CRN
Fabricated and stamped to ASME Section VIII for 150 psi working pressure, with Canadian Registration Number for cross-border projects.
Blowdown Drain and Air Vent
An integral brass blowdown valve clears collected sediment and an automatic air vent discharges separated air without shutting the system down.
ANSI Flanged Connections
Flanged ports simplify installation and removal on large-diameter mains and support higher flow rates.
Technical Specifications
| Connection Type | ANSI Flange |
| Connection Style | ANSI Flange |
| Separation Functions | Hydraulic separation |
| Maximum operating pressure | 150 psi |
| Medium temperature range | 32 - 220 deg F |
| Material | steel |
| Code Stamp | ASME Section VIII / CRN registered |
| Product Family | Hydro Separator |
| Shipping Weight | 220.0 lb |
Documentation
Design Resources
Related Products
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Frequently Asked Questions
What does Caleffi NA548120A do in a hydronic system?
Caleffi NA548120A provides hydraulic separation. A hydraulic separator creates a low-velocity zone between the boiler circuit and the distribution circuits so each pump operates against its own loop only, removing flow interference without relying on closely spaced tees.
Is Caleffi NA548120A ASME code stamped?
Yes. This model is fabricated and stamped to ASME Section VIII for 150 psi working pressure and carries a Canadian Registration Number for projects requiring provincial registration.
What is the warranty on Caleffi NA548120A?
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 Family:
- Hydro Separator
- Separation Functions:
- Hydraulic Separation
- Connection Style:
- ANSI Flange
- Connection Type:
- ANSI Flange
- ASME Code Stamped:
- Yes
- CRN Registered:
- Yes
- Max Operating Pressure:
- 150 psi
- Medium Temperature Range:
- 32 - 220 deg F
- Body Material:
- steel