Bathroom water heaters

Thank you all for great help 

Thank you all for great help 

If it's an instantaneous water heater over a basin, say, how likely is it that it would be used whilst the shower was in use?

If the basin only supplying a tap  the shower room?

Mike

Not that likely, but consider for example a nurse or care worker attending to a patient and washing their hands whilst patient uses the shower.

Or perhaps a maried couple who are not worried about privacy from each other., one showering and one washing hands/face in the bathroom.

It is unlikely that either device will be used for long, although they could be left on inadvertently.

Whilst small overloads of long duration are frowned upon (433.1), overloads of short duration are acceptable. A shower takes a few minutes. Washing one's hands in a basin, even less.