In shortR1234ze(E) is a very low-GWP HFO used in chillers and heat pumps as a replacement for R134a. Its pressure is lower than R134a, so a larger compressor is needed for the same capacity.
R1234ze properties
| Code | R1234ze |
|---|---|
| Chemical name / composition | trans-1,3,3,3-Tetrafluoropropene (R1234ze(E)) |
| Family | HFO |
| GWP (AR4, 100 years) | 7 |
| ODP | 0 |
| Safety class (ISO 817 / ASHRAE 34) | A2L: lower toxicity, mildly flammable |
| Boiling point (1 atm) | −19.0 °C |
| Temperature glide | None (pure fluid) |
| Charge equal to 5 t CO₂e | — |
| Status | Next generation |
Where is R1234ze used?
- Screw and centrifugal chillers
- High-temperature heat pumps
- Commercial building cooling plants
Service and safety notes
- Mildly flammable (A2L). Work away from ignition sources, use A2L-rated vacuum pumps, recovery units and leak detectors, and respect charge limits for the room size (EN 378).
- Never charge a system with a refrigerant other than the one on its nameplate; retrofits need manufacturer approval and oil and component checks.
- Charging, recovery and leak checks must be done and recorded by F-gas certified technicians.
R1234ze and regulations
Its very low GWP means F-gas restrictions practically do not apply. Safety rules for flammability, toxicity and pressure (EN 378 and related standards) still apply to system design, room size and charge.
Alternatives to R1234ze
Compare all refrigerants in our refrigerant guide.
Other refrigerants
R12R502R22R123R134aR404AR407CR407FR410AR417AR422DR507AR32R448AR449AR452AR454BR454CR513AR1234yfR1233zdR514AR290R600aR1270R744R717
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Frequently asked questions
What is the GWP of R1234ze?
The 100-year global warming potential (AR4) of R1234ze is about 7.
Is R1234ze flammable?
A2L: lower toxicity, mildly flammable.
What can replace R1234ze?
Depending on the application: R1233zd, R513A, R134a. Conversions require manufacturer approval and oil and component checks.