Hard Water, Soft Landing: How to Choose a Kitchen Mixer Tap That Still Works in Five Years

There's a particular noise a kitchen tap makes when it's had enough. A slight graunch as the lever moves. A dribble where there should be a spray. A spout that's gone chalky white around the aerator, like something dredged out of a kettle. If you live in the south-east of England, you've probably heard it.

Choosing a mixer tap looks like a five-minute job on a bathroom-showroom website. In practice it's one of the few kitchen purchases where the spec sheet matters almost as much as the look, because hard water is relentless and it doesn't care how good the tap looked in the photos. Here's how to buy one that survives.

First, find out what your water is actually like

Tap hardness is measured in milligrams of calcium carbonate per litre, or sometimes in degrees Clarke if your supplier is feeling old-fashioned. Under about 100mg/l you're in soft territory — most of Scotland, parts of Wales, the north-west. Above 200mg/l is hard, and plenty of the South East and East Anglia runs at 250–300+, which is squarely in the furring-up-your-kettle zone.

Your water company publishes a hardness figure by postcode, and it's worth two minutes of your evening. It's also worth knowing that hardness can vary within a supply area, and that a soft-water postcode doesn't guarantee a soft tap — limescale also comes from the hot water side, so a cylinder full of scale will find its way to your spout regardless.

Why bother? Because it changes what you should buy. In a very hard area, a cheap tap with a fussy internal design is a five-year tap at best. In soft water, you can be considerably more relaxed and spend the money on the finish instead.

The cartridge is the bit you'll end up cursing

The cartridge is the mechanism inside the body that controls flow and temperature. Ceramic disc cartridges are the standard now and are generally excellent — smooth, long-lived, and resistant to the grit that occasionally arrives through older pipework. Cheaper taps sometimes use plastic or lower-grade ceramic units, and these are where hard water does its damage: scale builds on the discs, the lever stiffens, and eventually you're wrestling it with two hands.

Look for a brand-name cartridge where the manufacturer names it (Kerox, Sedal and Vernet all turn up in decent taps), and check the tap is WRAS approved — that's the UK scheme that confirms it won't contaminate your drinking water, and it's a reasonable proxy for general build quality. A ten-year cartridge guarantee is a good sign; a one-year guarantee on a tap costing under £100 is telling you something.

One more thing worth checking: minimum operating pressure. Most modern mixers want at least 0.5 bar, and pull-out spray models often want 1.0 bar or more. If you've got a gravity-fed system with a tank in the loft, a high-pressure tap will deliver a sad trickle no matter how much you paid for it.

Finishes: pretty, but how do they age?

Chrome is boring and it's still the safest bet. It's hard, it hides scratches, and it shrugs off hard water better than most. If you want something warmer, look for PVD-coated finishes — brushed brass, brushed nickel, gunmetal — where a physical vapour deposition layer is bonded to the body rather than sprayed on. These hold up well to cleaning and to scale.

Powder-coated matt black is the one to think hard about. It looks superb in a dark, moody kitchen and it will show every hard-water spot in a bright one. Chips at the base are common if you're clattering pans against it, and once the coating lifts, water gets underneath. It's not a no, but it's a 'be honest about your cleaning habits'.

Whatever you choose, avoid abrasive creams and anything described as a descaler on a coated surface. Warm water, a microfibre cloth and a bit of washing-up liquid will do more for a tap than any specialist product.

Spray heads, aerators and the five-minute monthly job

The aerator is the little screw-on mesh at the end of the spout, and in a hard-water area it's where scale congregates first. Buy a tap with an aerator you can unscrew by hand — some need a special key, which is a small annoyance that becomes a large one when it's furred solid.

Pull-out spray heads are increasingly common and genuinely useful, especially over a sink run that's doing double duty as a veg-washing station. Look for rubber or silicone nozzles rather than hard plastic; you can rub the scale off with a thumb. Some spray heads have a removable faceplate, which is the easiest thing to live with long term.

A ten-minute soak in white vinegar every month or two will keep a decent tap working properly. If that sounds like too much admin, a whole-house softener starts to look like better value.

So: filter, softener, or neither?

Three different things get muddled here.

A tap-mounted or under-sink filter improves taste and reduces some scale in the drinking water line, but it won't protect the cartridge or the finish. It's a taste purchase, not a protection purchase. Cartridges need changing every six to twelve months, and in hard areas you'll notice when you're late.

A water softener genuinely removes hardness and will transform how long your tap, kettle and shower last. It costs £800–£1,500 installed plus salt, needs a power supply and a drain, and takes up space under the sink. If you're ripping out a kitchen anyway, this is the moment to do it.

A scale inhibitor or conditioner (the electronic coil type, or a phosphate dosing unit) is cheaper and less effective. It changes how scale behaves rather than removing the calcium. Some people swear by them; the physics is lukewarm. If you can't fit a softener, it's better than nothing.

Fit checks before you fall in love

Three measurements decide more kitchen tap purchases than any review: worktop hole diameter (most mixers need 35mm, some need 40mm+), tap height against your window or splashback, and spout reach against your sink bowl. A tall, dramatic tap in front of a low window is a heartbreak waiting to happen, and a short spout that stops 10cm shy of the bowl centre will annoy you every single day.

Also count your holes. If you're keeping a soap dispenser or a filtered drinking tap, you need the base to accommodate them, or a separate hole drilled before the worktop goes on.

What to spend in 2026

• £60–£120: perfectly reasonable basics from Bristan, Franke and own-brand ranges. Expect five to eight years in soft water, fewer in hard.
• £120–£250: the sensible middle. Better cartridges, replaceable aerators, solid chrome, decent guarantees. This is where most well-chosen British kitchens land.
• £250–£450: design-led brands, PVD finishes, pull-out sprays, and stronger guarantees. Worth it if the tap is a focal point.
• £450+: brassware as jewellery, plus boiling-water taps which start around £1,000 installed and need their own planning conversation.

The five-year test

Before you buy, ask one question: in five years, can I get a replacement cartridge and a new aerator for this tap? If the answer is no, put it back on the shelf, however lovely it looks. That single test separates the taps that age gracefully from the ones that end up in a skip with the old sink.

Hard water isn't going anywhere. Buy accordingly.