The Caleffi 548007A is a Hydro Separator unit providing hydraulic separation, with 4" NPT connections. 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.
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.
Technical Specifications
| Connection Size | 4" |
| Connection Type | NPT |
| Connection Style | Union |
| Separation Functions | Hydraulic separation |
| Maximum operating pressure | 150 psi |
| Medium temperature range | 32 - 212 deg F |
| Material | steel |
| Product Family | Hydro Separator |
| Shipping Weight | 17.0 lb |
Documentation
Design Resources
Related Products
- Caleffi 548102A : Hydro Separator 4" ANSI Flange
- Caleffi NA548102A : Hydro Separator 4" ANSI Flange ASME
- Caleffi 548067A : Hydro Separator 4" Press
- Caleffi 548097A : Hydro Separator 4" Sweat
Frequently Asked Questions
What does Caleffi 548007A do in a hydronic system?
Caleffi 548007A 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.
What size connection does Caleffi 548007A have?
It is supplied with 4" NPT connections. Sizing should be based on system flow rate rather than pipe size alone; other sizes in the Hydro Separator family are listed under Related Products.
What is the warranty on Caleffi 548007A?
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:
- Union
- Connection Type:
- NPT
- Connection Size:
- 4 inch
- ASME Code Stamped:
- No
- Max Operating Pressure:
- 150 psi
- Medium Temperature Range:
- 32 - 212 deg F
- Body Material:
- steel