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Actual KW Rating of Electric Shower

ebee

Did anyone ever get an answer from manufacturers?

Example, not that long ago really, they used to quote the the KW rating for 240V Electric showers, from that you could calculate the expected heater impedance and current rating.

So far so good.

Then our nominal voltage changed to 230V to Harmonise with Europe etc.

But the manufacturers kept their stated rating.

Some then pointed out that at 230V a straightforward resistive element (non electronic) shower would actually run at less current and less voltage (if the voltage was actually 230 not 240) therefore less KW. 

So they started, I think to list both ratings, probably to keep trading standards happy .

So, the advertised shower KW nowadays, which rating do they give in the headline power advert?

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    Well on the very new housing estate near us it really is 235 falling to 230 or 220 something at low point, while where I live (late 60s to 1970 built) the original transformers are still going strong and give ~ 250V in the middle of the night, and 240-245 during the day.  So it may be that post harmonisation the transformer out of the box default taps are not quite the same voltages. But as the transformers last for many decades, and at least half a century, it will be a good while before they are all wound down to the new voltage, if at all.

    And in the town centre all the pre-war TT overhead fed houses  are still getting more or less 240.

    Mike.

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  • 0

    Well on the very new housing estate near us it really is 235 falling to 230 or 220 something at low point, while where I live (late 60s to 1970 built) the original transformers are still going strong and give ~ 250V in the middle of the night, and 240-245 during the day.  So it may be that post harmonisation the transformer out of the box default taps are not quite the same voltages. But as the transformers last for many decades, and at least half a century, it will be a good while before they are all wound down to the new voltage, if at all.

    And in the town centre all the pre-war TT overhead fed houses  are still getting more or less 240.

    Mike.

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