1. Bearing Weight and Size
The weight of the bearing is the most important reference.
Small portable heaters (2–3 kW) are generally suitable for bearings below 30–40 kg.
For heavier bearings, higher power is required.
If the heater capacity is too small, heating time will be too long and efficiency will drop.
2. Inner Diameter of the Bearing
Check whether the yoke (magnetic core) matches the inner diameter.
If the yoke is too small or too large, heating efficiency will be affected.
Most industrial users require interchangeable yokes for different bearing sizes.
3. Required Heating Temperature
Standard installation temperature is usually around 80–110°C.
If the application requires higher temperature (for disassembly or special interference fit), the heater must have adjustable temperature control.
Temperature control accuracy directly affects installation quality.
4. Application Frequency
For occasional maintenance, a portable unit is sufficient.
For continuous industrial production lines, durability and cooling system design become important factors.
5. Working Environment
In steel mills or cement plants, dust and high temperature are common.
The equipment should have stable structure and simple operation.
Practical Suggestion
Before purchasing, prepare the following information:
Maximum bearing weight
Maximum bearing inner diameter
Required heating temperature
Frequency of use
With these parameters, selection becomes straightforward and avoids under-sizing or overspending.