An instantaneous electric water heater does not store hot water at all. Cold mains water passes through a heating element on its way to the tap, and the unit's kW rating decides how much temperature rise it can deliver at a given flow rate. Push more flow through it and the water comes out cooler; the physics does not bend. That makes instantaneous units a sensible spec for a single low-demand outlet, a small flat, a static caravan, a workshop sink or a holiday let where two people are never running hot water at once.
Plumb2U carries water softeners and the resin, salt and spare parts to keep them running, at trade prices with next-day despatch across the UK, whether the job is a first softener install or a service call on an existing one, for trade buyers from Epsom to anywhere else in the country.
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That is the practical filter for a trade buyer: check what is actually feeding the property first, cylinder type, boiler type and measured pressure, before recommending either option. An electric shower sidesteps a weak or inconsistent hot water system by generating its own supply on demand. A mixer shower only performs as well as the system behind it allows, which makes it the stronger choice specifically where that system is already strong.
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.
This is the practical case for softening in the parts of the UK where mains water runs hard: not as a lifestyle upgrade, but as protection for the heating elements, appliances and pipework that hard water otherwise wears down faster than it should. A softener does not fix existing scale damage on its own, but it stops new scale forming, which changes the maintenance picture on a property considerably over the following years.