-40°C to 100°C temperature range
External circulation (10 mm OD ports)
Pump flow 4-12 L/min
Fully enclosed compressor
LCD touch display, 0.1/0.01°C resolution
Over-temperature alarm
For jacketed reactors, analytical instruments, fermentation, and temperature-sensitive applications
Availability: In Stock
A refrigerated circulating water bath (also known as a low temperature thermostat bath, chiller circulator, or refrigerated circulator) provides precise temperature control from -40°C to 100°C with active external circulation. Hawach refrigerated circulating baths feature a fully enclosed compressor for fast cooling, low noise, and reliable operation. The built-in pump delivers constant-temperature liquid to external equipment (jacketed reactors, spectrophotometers, viscometers, fermentation vessels) via 10 mm OD external circulation ports.
Available in 5 capacity options (from 250×200×150 mm to 400×325×230 mm) and 5 temperature ranges (-5, -10, -20, -30, -40°C up to 100°C), with pump flow rates from 4 to 12 L/min. All models feature a microcomputer temperature correction, LCD display (0.1/0.01°C resolution), touch software for quick setting, and over-temperature alarm for instrument safety.
| If you need… | Temperature range | Recommended Cat# series | Key specs |
| General cooling (-5°C) | -5°C to 100°C | 18201028-18201032 | 4-12 L/min pump, 5 sizes |
| Lower temperature (-10°C) | -10°C to 100°C | 18201033-18201037 | 4-12 L/min pump, 5 sizes |
| Colder applications (-20°C) | -20°C to 100°C | 18201038-18201042 | 4-12 L/min pump, 5 sizes |
| Deep cooling (-30°C) | -30°C to 100°C | 18201043-18201047 | 4-12 L/min pump, 5 sizes |
| Ultra-low temperature (-40°C) | -40°C to 100°C | 18201048-18201052 | 4-12 L/min pump, 5 sizes |
Not sure which model fits your cooling requirement? Email info@hawach.com with your application and required temperature – our team will recommend the right configuration.
All models share the same design: fully enclosed compressor, LCD touch display, microcomputer correction, over-temp alarm, external circulation ports (10 mm OD). Below is the complete SKU list with temperature range, inner chamber dimensions, and pump flow rate.
| Cat# | Temp Range | Inner Chamber (mm) | Approx. Volume (L) | Pump Flow (L/min) |
| 18201028 | -5 – 100°C | 250×200×150 | ≈7.5 | 4 |
| 18201029 | -5 – 100°C | 250×200×200 | ≈10 | 8 |
| 18201030 | -5 – 100°C | 280×250×220 | ≈15.4 | 8 |
| 18201031 | -5 – 100°C | 280×250×280 | ≈19.6 | 10 |
| 18201032 | -5 – 100°C | 400×325×230 | ≈29.9 | 12 |
| 18201033 | -10 – 100°C | 250×200×150 | ≈7.5 | 4 |
| 18201034 | -10 – 100°C | 250×200×200 | ≈10 | 8 |
| 18201035 | -10 – 100°C | 280×250×220 | ≈15.4 | 8 |
| 18201036 | -10 – 100°C | 280×250×280 | ≈19.6 | 10 |
| 18201037 | -10 – 100°C | 400×325×230 | ≈29.9 | 12 |
| 18201038 | -20 – 100°C | 250×200×150 | ≈7.5 | 4 |
| 18201039 | -20 – 100°C | 250×200×200 | ≈10 | 8 |
| 18201040 | -20 – 100°C | 280×250×220 | ≈15.4 | 8 |
| 18201041 | -20 – 100°C | 280×250×280 | ≈19.6 | 10 |
| 18201042 | -20 – 100°C | 400×325×230 | ≈29.9 | 12 |
| 18201043 | -30 – 100°C | 250×200×150 | ≈7.5 | 4 |
| 18201044 | -30 – 100°C | 250×200×200 | ≈10 | 8 |
| 18201045 | -30 – 100°C | 280×250×220 | ≈15.4 | 8 |
| 18201046 | -30 – 100°C | 280×250×280 | ≈19.6 | 10 |
| 18201047 | -30 – 100°C | 400×325×230 | ≈29.9 | 12 |
| 18201048 | -40 – 100°C | 250×200×150 | ≈7.5 | 4 |
| 18201049 | -40 – 100°C | 250×200×200 | ≈10 | 8 |
| 18201050 | -40 – 100°C | 280×250×220 | ≈15.4 | 8 |
| 18201051 | -40 – 100°C | 280×250×280 | ≈19.6 | 10 |
| 18201052 | -40 – 100°C | 400×325×230 | ≈29.9 | 12 |
Note: All models are for external circulation only (no internal circulation option). The external circulation ports (10 mm OD) allow connection to external jacketed vessels, analytical instruments, or other temperature-sensitive equipment.
| Industry / Workflow | Typical Use | Recommended Model (by temp range) |
| Chemical synthesis | Cooling jacketed reactors, exothermic reactions | -20°C to -40°C models |
| Pharmaceutical R&D | Stability testing, crystallisation studies, API cooling | -10°C to -20°C models |
| Analytical laboratories | Cooling spectrophotometer cuvettes, viscometers, refractometers | -5°C to -10°C models |
| Biotechnology | Fermentation temperature control, enzyme reaction cooling | -10°C to -20°C models |
| Materials testing | Low-temperature property evaluation, thermal cycling | -30°C to -40°C models |
| Environmental & food | Sample cooling, extraction, preservation | -5°C to -20°C models |
A standard water bath provides heating only (up to 100°C). A refrigerated circulating water bath provides both cooling (down to -40°C) and heating, with active external circulation to deliver constant-temperature liquid to external equipment. It is essential for applications requiring precise temperature control below ambient.
No. All models in this series are designed for external circulation only. The pump delivers liquid to external equipment via the 10 mm OD ports. If you need internal circulation (uniform temperature inside the tank), please see our standard circulating water bath series.
Use standard laboratory tubing (10 mm inner diameter recommended) to connect the outlet and inlet ports on the bath to your jacketed reactor, spectrophotometer cuvette holder, or other equipment. The built-in pump will circulate the fluid.
Choose based on your lowest required temperature:
All models also heat up to 100°C for combined heating/cooling workflows.
Smaller capacities (7.5-10 L) are suitable for benchtop use and smaller external equipment. Larger capacities (15-30 L) provide greater thermal mass and longer run times for large jacketed reactors or multiple external devices.
Pump flow varies by model: 4, 8, 10, or 12 L/min. Higher flow rates are recommended for larger external systems or when long tubing distances are required.
The quality has a guarantee
Fast & safe shipping worldwide
