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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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    I doubt the 220V theory - most of the 220V world doesn't do 100A or even 60A domestic supplies - so things as big as instantaneous electric showers simply aren't going to sell. France for instance usually has a 30A or 45A single phase supply to a home. In Germany 32A-3-phase might be more common so in theory you could do it by spreading across two or three phases (as is commonly done with electric hobs) but I've never seen the option on a shower.

    Also the continentals have been using pressurized hot water cylinders for generations - so no problem getting a decent shower from the normal hot water system - unlike the open vented system traditional in the UK - so no need to use the rising main to get enough pressure. In most of the 220V world if you want an electrically heated shower, you'd just use an immersion.

        - Andy.

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  • 0

    I doubt the 220V theory - most of the 220V world doesn't do 100A or even 60A domestic supplies - so things as big as instantaneous electric showers simply aren't going to sell. France for instance usually has a 30A or 45A single phase supply to a home. In Germany 32A-3-phase might be more common so in theory you could do it by spreading across two or three phases (as is commonly done with electric hobs) but I've never seen the option on a shower.

    Also the continentals have been using pressurized hot water cylinders for generations - so no problem getting a decent shower from the normal hot water system - unlike the open vented system traditional in the UK - so no need to use the rising main to get enough pressure. In most of the 220V world if you want an electrically heated shower, you'd just use an immersion.

        - Andy.

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