On 17/11/2017 09:59, whisky-dave wrote:
On Thursday, 16 November 2017 20:05:21 UTC, Roger Hayter wrote:

In reality the 2kW will be at a particular
voltage, usually 240V in the case of electric showers which have a
similar rating system.

Because 240V is the maxuim continous voltage suplied by the gird to households.

Its the target, not the maximum. 253V is the official maximum.

BTW, I am quite sure they would not claim the 2kW was precise to the
nearest watt at any voltage. +/- 5% would be a reasonable achievement,
say 1.9 to 2.1kW. Or it could be a maximum, then 1.8 to 2.0kW. In the
latter case the 220V power might be as low as 1500W

So I was suprised to find that I was getting just 700W from a full on 2KW heater.

All that tells you is that either it was not full on (regardless of how
you had the controls set), or you have a serious undervolt problem.


--
Cheers,

John.

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