[quidnunc]

I think a "power shower" is one where the water comes out under pressure rather than coming down with only gravity to propel it.

I think that showers are actually a relatively recent thing in the UK since hot water heaters were very small and very slow.

A lot of London residences have their own water tanks built in because the water mains there are so old and decrepit that water pressure is negligible.

[Caesar Soze]

That's neat, but if pressurized hot water and a few chain stores are the only American contributions to the UK that this lady can think of, no wonder she hides under her delusory Canadian status.