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Install a water softener.
Twin-tank or single-tank softener sized to your household — eliminates limescale, extends appliance life.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Limescale damage
Boiler, kettle, taps. Cost of replacement.
Salt for drinking water?
Increases sodium slightly. Drinking tap remains hard.
Electronic descaler weak
Less effective than salt-based.
Maintenance forgotten
Salt top-up required.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Electronic descalerPlug-in/clamp-on
£50–£200
Magnetic water softenerInline magnetic
£100–£400
Salt-based softener (single tank)Standard
£400–£1.2k
Twin-tank softenerPremium, 24/7
£700–£2k
Installation labourPlumber
£200–£600
Annual salt supplyTablet salt
£50–£200
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Water Treatment explained
Water softeners remove calcium and magnesium causing limescale. UK hardness map shows 60% of homes in hard water areas. Expect to pay £500–£2,500 for UK water softener installation.
What Does the Work Involve?
Plumber installs at incoming mains. Salt-based ion exchange: most effective. Twin-tank for 24/7 soft water. Plumbed-in connections. Drain connection. Salt added regularly. Electronic descaler: cheap alternative.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Electronic descaler | 50 | 200 | Plug-in/clamp-on |
| Magnetic water softener | 100 | 400 | Inline magnetic |
| Salt-based softener (single tank) | 400 | 1,200 | Standard |
| Twin-tank softener | 700 | 2,000 | Premium, 24/7 |
| Installation labour | 200 | 600 | Plumber |
| Annual salt supply | 50 | 200 | Tablet salt |
| Service contract annual | 100 | 300 | Optional |
How Long Does It Take?
Installation: 2-4 hours.
DIY or Professional?
Plumber recommended. WaterSafe-approved.
Choosing the Right Tradesperson
WaterSafe scheme. APICS. WRAS-approved products. Manufacturer-approved installer.
UK Regulations
Water Supply (Water Fittings) Regs 1999. WRAS approval for installation. Drinking water must remain unsoftened tap separate.
Common Problems
- Limescale damage: Boiler, kettle, taps. Cost of replacement.
- Salt for drinking water?: Increases sodium slightly. Drinking tap remains hard.
- Electronic descaler weak: Less effective than salt-based.
- Maintenance forgotten: Salt top-up required.
Frequently Asked Questions
Is my area hard water?
South East, East Anglia, parts of Midlands: hard. Wales, Scotland, NW England: soft. Check water company.
Salt-based or electronic?
Salt-based: most effective, removes calcium. Electronic: cheap, partial effect, no chemical change.
Worth the cost?
Hard water area: saves £100-£300/year boiler/appliance maintenance. ROI 5-10 years.
Drinking softened water?
Hard water area: keep drinking tap unsoftened. Sodium concerns for babies/dietary.
Twin-tank or single?
Twin: 24/7 soft water. Single: regenerates at night (no soft during).
Best UK brands?
Harvey, Kinetico, BWT, EcoWater. WRAS-approved.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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