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.

Signs worth watching for on a job include a shower or tap that has visibly lost pressure without any obvious blockage, a heating element or immersion that keeps tripping or under-performing, white scale flaking off fittings when they are removed, and appliances needing more frequent descaling or repair than would be expected. Individually, any one of these could have another cause. Together, in a property in a known hard-water area, they point fairly clearly at scale.

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.

Hard water carries dissolved calcium and magnesium, and neither mineral goes anywhere quietly. As water heats up, those minerals come out of solution and form limescale, a hard, chalky deposit that builds up wherever hot water sits or flows. The most obvious place it shows up is on immersion heaters and heating controls supplier elements, where a coating of scale acts as insulation, forcing the element to work harder and longer to heat the same volume of water. Over time that means higher running costs and, eventually, elements that fail well before they should.

Neither option is a universal upgrade over the other; each solves a different starting condition, and the right call is decided by the pipework already in the property, not by brand preference.

Find out more at plumbing spares supplier.