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A rubber flexible hose is typically a single-layer or reinforced rubber tube, sometimes with a fabric or wire reinforcement moulded inside rather than wrapped around it. It is generally the cheaper option, flexible enough to route around awkward bends, and perfectly serviceable for lower-pressure, lower-duty applications. Its weak point is the outer surface: rubber degrades under UV exposure, ages with heat cycling, and can perish or crack over time in a way that is not always obvious from the outside until it fails.

A flexible hose looks like the simplest part on a plumbing job, right up until the wrong one is fitted and something fails under pressure. Getting the spec right starts with bore size: the internal diameter of the hose has to match the fitting and the flow the job actually needs, not just whatever thread happens to fit at the tap end. Too small a bore restricts flow and pressure at the outlet; matching it correctly keeps performance consistent with the rest of the system.

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.

Water pressure and flow available at the shower's cold feed matter just as much as the electrics. An electric shower can only heat the water that reaches it; a poor incoming flow rate limits performance regardless of how high the kW rating goes, since there is simply less water for the unit to raise in temperature.

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