Hot Air Oven vs Incubator vs BOD Incubator: Which Does Your Lab Need?
A hot air oven, a bacteriological incubator and a BOD incubator are all insulated cabinets with a temperature controller, so they are often confused. The difference is the temperature range and what each one is built to do. Buying the wrong one is a common and expensive mistake, so this guide sets out the differences plainly.
The short answer
- Hot air oven: high heat, roughly 50–250°C, for drying and dry-heat sterilising glassware and samples.
- Bacteriological incubator: gentle warmth just above room temperature (typically up to 60–80°C, used mostly at 37°C) for growing cultures.
- BOD incubator: can cool below room temperature as well as heat (about 5–60°C), so it holds a set temperature such as 20°C all year round.
Hot air oven
A hot air oven uses heaters and a fan to circulate hot air evenly through the chamber. Typical uses are drying glassware, moisture determination, heat-treating components and dry-heat sterilisation. Common textbook cycles for dry-heat sterilisation are 160°C for 2 hours or 170°C for 1 hour, although your own validated method always takes priority.
Our PT-400 hot air oven runs from 10°C above ambient up to 250°C (300°C on the PT-400E) with ±0.5°C control. It comes in sizes from 27 to 330 litres, with a thermostat or digital PID controller and an MS or SS 304 body.
If your samples are heat-sensitive or contain solvents, a vacuum oven such as the PT-415 dries them at a lower temperature under vacuum.
Bacteriological incubator
An incubator keeps cultures at a steady, uniform temperature, most often 37°C for bacteria. It only heats, so it cannot hold a temperature below the room temperature. That is fine in a cool lab, but on a hot Indian summer day the room may be warmer than your set point.
Our PT-410 bacteriological incubator works from 10°C above ambient up to 80°C with ±0.5°C PID control and a motorised blower for uniform temperature. It is the usual choice for microbiology, pathology, food and dairy labs, and teaching labs.
BOD incubator
A BOD (biochemical oxygen demand) incubator has a compressor for cooling as well as a heater, so it can hold any temperature from about 5°C to 60°C regardless of the room. It is named after the standard BOD test, in which water samples are incubated at 20°C for 5 days. It is equally useful for microbiology, seed germination, stability studies and any work that needs a temperature below ambient.
Our PT-417 BOD incubator covers 5°C to 60°C with ±0.5°C PID control, a CFC-free compressor and sizes from 173 to 340 litres. If you also need shaking, the PT-420 BOD incubator with orbital shaker holds sixteen 250 ml flasks.
Side-by-side comparison
| Hot air oven | Incubator | BOD incubator | |
|---|---|---|---|
| Typical range | Ambient +10°C to 250°C | Ambient +10°C to 80°C | 5°C to 60°C |
| Cooling | No | No | Yes (compressor) |
| Main use | Drying, dry-heat sterilisation | Growing cultures at 37°C | BOD test at 20°C, below-ambient work |
| Typical labs | Pharma, chemistry, materials, food | Microbiology, pathology, dairy | Water and wastewater, ETP/STP, microbiology, seed testing |
| Popular Traders model | PT-400 | PT-410 | PT-417 |
Which should you choose?
- You need to dry or sterilise glassware: a hot air oven.
- You grow bacterial cultures at 37°C and your lab stays below that temperature: a bacteriological incubator.
- You run BOD tests, need a temperature below room temperature, or your lab gets hot in summer: a BOD incubator.
Many labs use two of the three. For GMP areas, choose the SS 304 body versions. IQ/OQ/PQ documentation and NABL calibration are available on request.
Frequently asked questions
Can a hot air oven be used as an incubator?
It is not recommended. A hot air oven is designed for high temperatures and is less uniform and stable at 37°C than a purpose-built incubator.
What is the difference between an incubator and a BOD incubator?
A BOD incubator has a compressor, so it can cool as well as heat and hold temperatures below the room temperature. A standard incubator can only heat.
At what temperature is the BOD test done?
The standard BOD test incubates water samples at 20°C for 5 days, which is why a BOD incubator needs cooling.
What temperature is used for dry-heat sterilisation?
Common cycles are 160°C for 2 hours or 170°C for 1 hour. Always follow your own validated method.
How do I get a quotation?
Use “Make an enquiry” on any product page, WhatsApp us on 8199900060, or email popular1942@gmail.com with the size and controller you need.