Brazed Plate Heat Exchanger
Sealed brazed construction without gaskets or bolts — ideal for compact OEM applications, refrigerant evaporators and condensers, and domestic hot water.
Sealed brazed construction without gaskets or bolts — ideal for compact OEM applications, refrigerant evaporators and condensers, and domestic hot water.
- Refrigeration circuits
- Heat pump evaporators and condensers
- Domestic hot water
- Compact OEM equipment
- · Plate / tube material
- · Design pressure & temperature
- · Connection type and size
- · Code and certification
Brazed Plate Heat Exchanger Overview
Short answer
A brazed plate heat exchanger is a stack of stainless plates vacuum-brazed with copper or nickel filler into a sealed unit with no gaskets, bolts or frame. It is selected where the duty is clean, the pressure is above the gasketed envelope — standard units are rated to 4.5 MPa, with CO₂ versions higher — and the exchanger must be compact and maintenance-free inside a chiller, heat pump, hydraulic package or hot-water module. Copper brazing suits HVAC and refrigeration media; nickel brazing is specified for ammonia, demineralized water and other services that attack copper. The pack cannot be opened, so fouling duties need pre-filtration or CIP.
A Brazed Plate Heat Exchanger (BPHE) is a fully sealed plate-pack assembly in which stainless-steel plates are vacuum-brazed together using a copper or nickel filler. The result is a compact, gasket-free, bolt-free pressure vessel with the thermal performance of a plate exchanger and the pressure integrity of a welded vessel.
Because there are no elastomer gaskets, a BPHE can be specified for higher pressures and lower temperatures than a gasketed unit, making it the standard choice for refrigeration evaporators and condensers, heat-pump systems, oil cooling, and compact OEM equipment.
Copper-brazed units are the workhorse for HVAC and refrigeration duties with clean, non-corrosive media. Nickel-brazed variants are used where copper would be attacked — ammonia systems, deionized water, and certain process chemicals.
Operating Conditions
| Design pressure | Up to 4.5 MPa (45 bar) standard; high-pressure versions to 14 MPa (140 bar) for CO₂/R744 |
| Design temperature | −196 °C to +225 °C (copper-brazed); to +400 °C (nickel-brazed, short-term) |
| Heat transfer area | 0.01 – 60 m² per unit |
| Connection sizes | From ¼" / DN6 up to DN100, threaded, soldered or victaulic |
| Plate thickness | 0.3 – 0.5 mm AISI 316 / 316L |
Materials of Construction
| Plates | AISI 316 or 316L stainless steel, herringbone pattern |
| Brazing filler | Copper (HVAC and refrigeration) or nickel (ammonia, deionized water, aggressive media) |
| Connections | Stainless, carbon steel, or specialized refrigeration fittings |
Choose this when / Do not choose this when
A quick suitability check before you commit to a construction.
Choose this construction when
- The media are clean and the unit can stay sealed for its service life
- Design pressure is above the gasketed frame envelope — standard brazed units are rated to 4.5 MPa, CO₂ versions higher
- Space and weight are critical, typically inside an OEM chiller, heat pump or hydraulic package
- The duty is a refrigerant evaporator, condenser, economizer or oil cooler
- No gasket maintenance or bolt retorquing is wanted in the field
- Ammonia or demineralized water is present and a nickel-brazed variant is specified
Do not choose this construction when
- The service fouls and no pre-filtration or CIP is available — the pack cannot be opened
- The medium carries solids or fibres
- The duty may grow and the unit would have to be re-rated or expanded
- Field repair of the exchanger is a requirement
- Copper is attacked by the medium and a nickel-brazed option has not been confirmed
- Very large heat transfer areas are needed — above the brazed size range, use gasketed or welded plate
Selection Parameters
Information our engineering team uses to size and quote this unit.
- Refrigerant or process medium on each side
- Evaporating/condensing temperature and pressure (for refrigeration)
- Mass flow rate and required heat duty
- Subcooling / superheat requirements
- Connection style required by the system (solder, flare, victaulic, threaded)
- Whether the duty involves ammonia or demineralized water (drives copper vs. nickel brazing)
RFQ Data Checklist
Send the items below with your inquiry for the fastest accurate quotation.
- Application (chiller, heat pump, oil cooler, DHW, etc.)
- Refrigerant or medium on each side
- Flow rate or capacity (kW), inlet and outlet temperatures on each side
- Design / max working pressure and design temperature on each side
- Allowable pressure drop on each side
- Water quality or corrosion data (chlorides, demineralized water, ammonia) — decides copper vs nickel brazing
- Fouling tendency and whether pre-filtration or CIP is available
- Connection type and orientation required
- Code and inspection requirements (PED, PRD sizing, refrigerant approvals)
- Quantity and target unit price band
Brazed Plate Heat Exchanger Industry Applications
R32 evaporator for residential and commercial heat-pump systems, copper-brazed 316L, optimised for low refrigerant charge.
Lube-oil to water cooling on an industrial hydraulic system, compact unit mounted directly on the reservoir.
Instantaneous DHW production from district heating supply — sized for 60 °C delivery with 80 °C primary.
Nickel-brazed BPHE used as economizer on a screw-compressor ammonia plant for industrial cold storage.
Brazed Plate vs Gasketed Plate Heat Exchanger
Both are plate heat exchangers, but the construction drives very different operating windows, service strategies and price points. Use the table below to pick the right one for your duty.
| Brazed Plate (BPHE) | Gasketed Plate (GPHE) | |
|---|---|---|
| Construction | Vacuum-brazed plate pack — sealed, no gaskets or bolts | Plate pack with peripheral gaskets, clamped between frame plates |
| Max design pressure | Up to 45 bar standard; 140 bar for CO₂ versions | Typically up to 25 bar |
| Max design temperature | +225 °C (copper-brazed); +400 °C (nickel-brazed, short-term) | ≈ +180 °C, limited by gasket compound |
| Heat transfer area range | 0.01 – 60 m² per unit | 0.1 – 2,500 m² per unit |
| Field serviceability | Not openable — CIP cleaning only, no plate or gasket replacement | Fully openable — inspect every plate, replace gaskets, add/remove plates |
| Footprint & weight | Most compact option, ideal for OEM packaging | Compact vs shell-and-tube, larger than BPHE for equivalent area |
| Typical media | Clean refrigerants, water, glycols, oils — no ammonia with copper brazing | Water, glycols, oils, mildly aggressive chemicals (gasket-dependent) |
| Best-fit duties | Refrigeration evaporators/condensers, heat pumps, oil cooling, DHW modules, OEM chillers | District heating, dairy/food, central HVAC, process cooling, large industrial duties |
| Relative cost | Lower at small sizes; fixed unit (replace if it fails) | Higher at small sizes; lower lifetime cost on serviceable duties |
Frequently Asked Questions
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Sourcing, verification and next steps
Every unit is engineered to the confirmed duty, materials and inspection scope of the order. Design codes, test certificates and third-party inspection are quoted as options and confirmed per project rather than assumed. See our heat exchanger manufacturing and OEM capability, the quality control and inspection workflow, and the heat exchanger cost guide for what drives price. For a first-pass thermal check, use the heat exchanger sizing calculator, then send your process data for a quotation.
Need a Heat Exchanger for Your Project?
Send your working conditions, drawing or datasheet. Blair will review your request and help confirm the next step.