You can't go wrong with a Triton XR 9.5kW. Triton's a good named
brand with a guarantee.
Alternatively, you could opt for a New Team shower such as the Cascade
Waltz Electric Shower, which is made by the Bristan brand. It's
reasonably priced and does the job.
If your friend has a bit more money to burn, then I'd recommend
something like an Aqualisa Quartz Electric Shower. The great thing
about Aqualisa showers is that almost every part is interchangeable/
swappable as they have a complete spare parts catalogue. I know it
doesn't sound good when you're just about to buy, but I've had to
replace a whole shower unit just for the want of a single part on a
cheaper shower model.
Best of luck!
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