Are induction hotplates safe to use as a cooking stove?
This is probably the single most asked question by consumers contemplating the purchase of this cooking device of rising popularity.
A recent joint test between the Consumer Council and the Electrical and Mechanical Services Department (EMSD), has provided the answer to help consumers in their choice.
In the test, 10 models were rated on a 5-point scale based on construction (35%), temperature rise (30%), magnetic radiations (10%), abnormal operations (10%), material resistance to heat and flames (10%), markings and instructions (5%).
The test results showed that some samples were better in safety than the others, and that a higher price is no guarantee to better safety.
Out of the 10 test samples, 4 were awarded the full top score of 5 points. The 4 models were priced from about $500 to $700 - the most expensive model was around $1,900.
The remainder 6 samples were rated from 4.7 points (1 sample), 4.6 points (4 samples) to 4.2 points (1 sample). Minor non-compliance was found in these samples in respect of construction and temperature rise.
Another safety concern relates to the magnetic radiation generated from induction hotplate which may have the potential to affect human health.
This concern, however, was unfounded. The magnetic flux radiation, measured in accordance with the European Standard, was shown to be lower than the permissible limits.
Safety deficiencies in construction were found in 2 samples during an impact test - in one, the top ceramic plate was broken, and in the other, part of the plastic ventilation slots at the bottom was broken, posing in both cases potential risk of accidentally touching the internal parts. However, it is still safe under normal operation condition.
Other safety deficiencies included: loose screw for fixing internal wires, inappropriate internal wiring connection methods, insufficient insulation distances, and relatively high temperature rise of internal parts.
The EMSD has followed up with the suppliers of the induction hotplates concerned, who undertook to make corresponding improvements on the quality of their products. Some useful tips on usage of induction hotplates:
- Never use a hotplate whose surface is cracked or damaged.
- Do not switch on the electricity supply until the hotplate is ready for use.
- Ensure good ventilation to avoid overheating.
- Do not put too much soup to avoid splashing over the hotplate when boiling.
- Cover the utensil, if possible, to save energy.
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