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The kilowatt rating printed on an electric shower's box is the single number most buyers look at first, and it is also the most misunderstood. A higher kW rating does not mean a more powerful shower in every sense; it means the unit can heat a given flow of water through a larger temperature rise. Those two things, flow rate and temperature rise, are locked together by the electrical supply available, and pushing one up necessarily limits the other.
Plumb2U stocks both electric and mixer showers, along with the pumps, valves and fittings that go with each system type, at trade prices with next-day despatch, for buyers matching the shower to what the property's pipework can genuinely support.
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Ask a plumbers merchants counter which electric shower spares move fastest, and the same short list comes up again and again: heating elements, thermal cut-outs, and flexible hoses. These are not the parts on a spec sheet that get much attention when a shower is first fitted; they are the parts that wear, age or trip over years of daily use, and they are what trade buyers are usually restocking for rather than fitting from new.
Serious DIY buyers and trade buyers speccing a softener for a client both need to think in terms of resin capacity matched to household size and water hardness, not just the headline price of the unit. An undersized softener will regenerate constantly and burn through salt; an oversized one is money spent on capacity that is never used.