On 04/07/2020 11:55, Dave Plowman (News) wrote:
In article ,
wrote:
On Friday, 3 July 2020 11:19:23 UTC+1, Dave Plowman (News) wrote:

So you stand by his claim that an electric convector heater is 100%
efficient? Just curious.

I said some are, not all are. Oil filled ones that overheat, glow red
hot & catch fire may have more heat output than input


And those that simply expand? As all will?

It only expands once. After that it is 100% efficient.

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Max Demian