Hard Water & Limescale in Kingston and SW London: What It's Actually Costing You
Most of the Kingston and SW London area sits on hard water — here's what scale is doing to your boiler, shower and taps, and what's worth treating.
Water supplied across most of the Kingston and wider SW London area is classified as hard to very hard. That's not a health issue — it's a maintenance one, and it's quietly costing money in ways most homeowners don't connect to their water supply.
What scale actually does
Deposits build wherever water's heated or aerated: reduced hot water flow from a combi, a shower that spits and loses pressure, kettling noises from the boiler, seized ceramic tap cartridges, and immersion heaters that fail early. Even a few millimetres of scale on a heat exchanger measurably increases gas use.
Scale reducer or full softener?
An in-line scale reducer (fitted on the cold main before the boiler) is small, affordable and discourages scale from bonding — decent protection for the boiler, limited benefit at the taps. A salt-based softener genuinely removes hardness across the whole house — no scale in the shower, longer appliance life — but needs cupboard space and salt top-ups, and building regulations require a hard-water tap to stay at the kitchen sink for drinking.
A sensible middle ground
If you're having a new boiler fitted, add a scale reducer at the same time — it protects a long warranty for a small extra cost. A full softener is usually worth it if you're doing a full bathroom renovation, or dealing with young children and dry skin in the household.