The technical data of a number of products (e.g. similar to https://www.farnell.com/datasheets/3120980.pdf) suggests the actual heat output is about half that of the headline rated figure (i.e. what looks good on the box).
That 650Watt rated item, for example, has a nominal of 0.3492kW, i.e. ~54%. A 2500Watt item has a nominal of only 0.9360kW, i.e. ~37%, which all seems a bit misrepresentation-y.
As the nominal is often given to 4 decimal places, there is presumably a good technical reason for knowing this level of precision.
Does this suggest, say, the mains power is half-wave rectified? Or is that due to an On/Off timer circuit (some kind of slow PWM). Or is it due to the internal cut-out?
I am guessing the heater element and mechanical gubbins is rated to the higher figure, and the complete product delivers the nominal.
Alternatively, this 2500W product only talks about heat output....
That 650Watt rated item, for example, has a nominal of 0.3492kW, i.e. ~54%. A 2500Watt item has a nominal of only 0.9360kW, i.e. ~37%, which all seems a bit misrepresentation-y.
As the nominal is often given to 4 decimal places, there is presumably a good technical reason for knowing this level of precision.
Does this suggest, say, the mains power is half-wave rectified? Or is that due to an On/Off timer circuit (some kind of slow PWM). Or is it due to the internal cut-out?
I am guessing the heater element and mechanical gubbins is rated to the higher figure, and the complete product delivers the nominal.
Alternatively, this 2500W product only talks about heat output....
