What you need to know
- Input power can be higher than cooking output.
- Short operating time often keeps total kWh modest.
- Compare appliances using the same cooking task, not just their rated watts.
Use your own measurements
BricoDato tools help turn the guide into quantities, kWh, cost or a project plan.
Input power vs cooking power
A microwave sold as “800 W” may draw more than 1,000 W from the socket. Look for input power on the rating label or technical data.
Calculate from real minutes
Convert minutes to hours and multiply by kW. Ten minutes per day is only one-sixth of an hour, so time has a large effect on monthly energy use.
When it can beat an oven
For reheating or small portions, avoiding oven preheat and long cooking times can reduce energy use.
Measure combined modes separately
Grill or convection combination modes can change the electrical load and should not be treated as microwave-only use.
Final check
Before buying material or doing the work, review the assumptions and technical limits that matter for your specific product, room or installation.
- Use input power from the label.
- Add all daily minutes.
- Separate grill / convection use.
- Compare the same food quantity when testing alternatives.
Keep a small job sheet
Record the measurements, product reference, technical values you used, date and final result. For maintenance or diagnostics, also note the conditions at the time. A short written record makes future comparisons much more reliable.
Turn the guide into a decision
Use your measurements and the manufacturer’s technical data. If the decision affects fixed electrical work, structure, hidden leaks, refrigerant systems or another safety-critical installation, consult a qualified professional.