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+The heating element is the part doing the actual work, raising the temperature of the water as it passes through the unit, and it is also the part most exposed to hard water. In areas with harder mains supply, elements pick up scale over time in exactly the way any heating element does, which reduces efficiency and eventually causes failure, showing up as a shower that runs cold, runs lukewarm, or trips out shortly after being switched on.
+A storage or cylinder-based electric water heater works differently. It heats a fixed volume ahead of demand and holds it at temperature, ready to deliver decent flow to more than one outlet at a time. The trade-off is recovery time: once the stored volume is drawn down, the immersion element needs time to bring the next tankful back up to temperature. For a family bathroom, a kitchen and an en suite all wanting hot water within the same hour, a cylinder with enough capacity usually outperforms an instantaneous unit trying to keep pace.
+Plumb2U carries the parts and spares for both instantaneous and storage electric water heaters, from elements and thermostats to the fittings that connect them into a system, at trade prices with next-day despatch across the UK. For merchants and installers working from a plumbers merchants account rather than a shop counter, that means the right spare is one order away, not a special one.
+Length matters just as much, and not only for reach. A flexi hose that is too long for the gap it is bridging tends to kink or sit under unnecessary strain, both of which shorten its working life. Too short, and it is either fitted under tension or simply does not reach, forcing a compromise on the install that causes problems later. The right length sits with a gentle curve, not a tight bend, and not stretched taut.
+An electric shower needs almost nothing from the existing hot water system, because it does not use it. It draws cold mains water and heats it instantaneously inside the unit itself, using its own dedicated electrical supply. That makes it the practical choice on properties with low or inconsistent water pressure, combination boiler systems where hot water competes with other demands, or any property where running a strong, consistent supply of pre-heated hot water to the shower simply is not realistic. Its performance depends on electrical capacity and incoming mains flow, not on the property's cylinder or boiler at all.
+Pressure rating is where corners genuinely should not be cut. Every [[https://cooking-guide.com/details/aHR0cDovL2tvcGFjLmNvLmtyL3hlL2luZGV4LnBocD9taWQ9Ym9hcmRfcXdwRjUzJmRvY3VtZW50X3NybD0zMzI1Mjgz/|flexible hose supplier]] hose has a working pressure it is designed and tested to, and mains-fed systems, unvented cylinders in particular, run at higher sustained pressure than an old gravity-fed tank system ever did. A hose rated for low-pressure use has no business being fitted on a mains-pressure job, regardless of whether the thread happens to match.

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