"Andrew Gabriel" wrote in message
...

If I was designing a shower like these, I'd use a high current
triac to do the switching, heaksunk to the incoming water supply.
Not to mention that would also give you the capability of more
proportional control too.

Heh - I've never felt the need to have proportional power control on an
electric shower, since they're never powerful enough anyway :-)

(maybe to cool down at the end though - but I imagine the showers which do
that merely run the water a bit after switching the kettle off).