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COLO.Science · Heating & Thermal Processing · Water Bath
PURUS Thermostatic Water Bath · 11 L or 36 L · with or without test tube rack · RT+5 to 100 °C
The thermostatic water bath PURUS comes in two sizes, 11 L and 36 L, and with two inserts: a lid plate with holes and concentric rings for beakers and flasks, or a stainless steel rack for test tubes. The PID controller keeps the water from RT+5 °C to 100 °C with 0.1 °C resolution, and the hinged stainless steel lid limits evaporation.
Versions and order codes
| Model | Order code | Tank | Insert | Temperature | Supply |
|---|---|---|---|---|---|
| PURUS11 | PRO3225 | 11 L · 420 × 180 × 140 mm | lid plate with rings | RT+5 to 100 °C | 220 V / 110 V, 500 W |
| PURUS11S | PRO8257 | 11 L · 420 × 180 × 140 mm | test tube rack | RT+5 to 100 °C | 220 V / 110 V, 1000 W |
| PURUS36 | PRO3224 | 36 L · 600 × 300 × 200 mm | lid plate with rings | RT+5 to 100 °C | 220 V, 750 W |
| PURUS36S | PRO2375 | 36 L · 600 × 300 × 200 mm | test tube rack | RT+5 to 100 °C | 220 V, 2000 W |
All four versions: RT+5 to 100 °C, resolution 0.1 °C, PID controller and hinged stainless steel lid. Versions with the test tube rack (S) have a higher heating power for faster heat-up.
One water bath, four versions
PURUS is chosen by two questions: how much water you need and what you put in it. The 11 L version fits a small bench, the 36 L version takes larger batches. Beakers and flasks sit in the ring openings of the lid plate, which close around vessels of different sizes; test tubes stand in the stainless steel rack. The hinged lid stays open at the back while you load samples and closes over the tank to keep the temperature even.
Key features
- Temperature RT+5 °C to 100 °C, resolution 0.1 °C, for all versions
- Stainless steel tank 11 L (420 × 180 × 140 mm) or 36 L (600 × 300 × 200 mm)
- Lid plate with holes and concentric rings, or stainless steel test tube rack
- PID controller with actual (PV) and set (SV) value display
- Hinged stainless steel lid with handle
- Powder-coated steel housing, 500 to 2000 W depending on version
Suitable for
- Test tubes in a rack at the same temperature
- Beakers, flasks and bottles in the ring openings
- Incubation of samples, warming reagents and media, thawing
- Teaching labs and routine QC steps up to 100 °C
Which version to choose
Test tubes → PURUS11S or PURUS36S with the rack; beakers and flasks → PURUS11 or PURUS36 with the ring plate. For more than 36 L see the PURUS62 large water bath, for single vessels held in separate holes the ODRA62 six-hole water bath, and when the samples must also be shaken the ORSHAWB shaking water bath.
Technical specifications
Temperature and control
| Temperature | RT+5 to 100 °C |
| Resolution | 0.1 °C |
| Stability | ±0.5 °C |
| Control | PID |
| Display | LED, PV and SV |
Tank and construction
| Tank | 11 L or 36 L, stainless steel |
| Tank size | 420 × 180 × 140 / 600 × 300 × 200 mm |
| Insert | ring plate or test tube rack |
| Lid | hinged, stainless steel |
| Supply | 220 V, 50 Hz (11 L also 110 V) |
RT = room temperature. Values measured with water, without load. Ask us for packing size and weight.
Installation and care
Place the bath on a level, dry bench next to an earthed socket. Fill the tank with distilled or deionised water above the heater before switching on the heating, keep the lid on to reduce evaporation, and change the water regularly to keep the stainless steel tank clean.
Standard delivery and options
- Thermostatic water bath with stainless steel tank, 11 L or 36 L.
- Hinged stainless steel lid.
- PURUS11 and PURUS36: lid plate with holes and concentric rings.
- PURUS11S and PURUS36S: stainless steel test tube rack.
The configuration for a specific order is the one confirmed in the COLO.Science quotation.
Technical documents and knowledge base
PURUS technical specification (PDF) — all four versions, tank sizes, temperature data and configuration checklist. Methods and application notes: our knowledge base.
Configuration note
Tell us what you heat, the vessels per run and the temperature. COLO.Science will confirm the version and the delivery time in the quotation.
Sales and support for international customers
COLO Lab ExpertsPolje ob Sotli 4, SI-3255 Buče, Slovenia
Phone: +386 70 713 437 · Email: sales@colo.si · Web: colo.si
We supply laboratories across Europe directly and through partners. B2B prices are quoted net, excluding VAT.
