Material choice, braided stainless outer versus a plain rubber hose, changes the durability picture too, and is worth its own consideration alongside bore, length and rating.

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.

Plumb2U stocks water softener supplier UK softeners alongside the elements, valves and fittings that hard water damage tends to bring in for replacement, at trade prices with next-day despatch, for trade buyers dealing with the practical, unglamorous end of hard-water problems on a daily basis.

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.

The reverse mismatch causes different problems. A heater oversized for a small cylinder can bring water to temperature faster than expected, which sounds like an advantage until it starts cycling on and off more often than it should, putting extra wear on the element, the thermostat and the switching components around it. Neither mismatch is a fault with the parts themselves; both are a sizing problem between two components that were never actually chosen to work together.

That process cannot run forever. Resin has a finite capacity, and once enough calcium and magnesium have attached themselves to the beads, there is no sodium left to exchange and the softener stops softening. That is where regeneration comes in. On a schedule, or triggered by a meter tracking actual water use, the softener flushes the resin tank with a strong brine solution made from the salt in the softener's storage tank. The high concentration of sodium in the brine reverses the exchange, stripping the calcium and magnesium back off the resin and sending it to drain, while recoating the beads in sodium ready for the next cycle.