Last reviewed: June 2026 by the Water Softener Quotes editorial team

5 things to check before buying

Getting the right softener first time saves you money and hassle. These five checks take minutes.

1

Check your water hardness

Enter your postcode at check-your-water.co.uk. Above 200ppm = hard, above 300ppm = very hard. This determines the capacity you need.

2

Count your bathrooms

1–2 bathrooms can use entry-level units. 3–4 bathrooms need mid-range. 5+ bathrooms or high usage (large family, en-suites) need premium or twin-tank.

3

Measure your install space

Most softeners fit under the kitchen sink (W 22cm × D 47cm × H 50cm typical). Utility cupboards and garages work too. Your installer will confirm.

4

Choose your salt type

Block salt is compact and easy to load (ideal for under-sink). Tablet salt is cheaper per kg but needs a brine tank. Granular salt dissolves fastest for heavy use.

5

Get 2–3 quotes

Always try to compare quotes where possible — unit price, install cost, warranty length, and annual servicing terms. The number of quotes depends on installer coverage in your area.

What’s included in a quote

When you request quotes through us, each installer provides a full breakdown. Here’s what to expect.

  • Water softener unit (matched to your home)
  • Professional installation by a vetted engineer
  • Bypass valve (so you can isolate the softener)
  • Waste pipe connection for regeneration
  • Initial salt supply to get started
  • Manufacturer warranty (typically 2–10 years)
  • Post-install water hardness test
  • Written quotation with no hidden extras

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Buying a water softener — your questions answered

Straight answers to what people ask before they buy.

What should I look for when buying a water softener?

Focus on four things: capacity (matched to your household size and water hardness), salt type (block, tablet or granular), warranty length (aim for 5+ years on parts), and physical dimensions (it needs to fit under your sink or in a utility cupboard). Non-electric models are lower maintenance; electric timer-based models offer more precise regeneration scheduling.

How do I know what size water softener I need?

Size is based on two factors: the number of bathrooms in your home and the hardness of your local water supply. A 1-2 bathroom home in a moderately hard area can use an entry-level unit. 3-4 bathrooms or very hard water (above 300ppm) needs a mid-range or premium model with a higher grain capacity.

Is it better to buy a block salt or tablet salt softener?

Block salt softeners are more compact and easier to load (just slide blocks in), making them popular for under-sink installs. Tablet salt systems tend to be slightly cheaper to run per kg of salt but need a separate brine tank. For most UK homes, block salt is the more practical choice.

Can I install a water softener myself or do I need a professional?

Professional installation is strongly recommended. A qualified installer will ensure the unit is correctly plumbed into your mains, the bypass valve is fitted properly, and the waste pipe is connected to a drain. DIY installation can void the manufacturer warranty and risks leaks or incorrect setup.

How long does a water softener last?

A quality water softener typically lasts 15-20 years with proper maintenance. The resin bed may need replacing after 10-15 years depending on water hardness and usage. Budget models may only last 8-12 years. Regular salt top-ups and an annual service check keep the unit running efficiently.

Are water softeners worth the investment?

For homes in hard water areas (most of England and Wales), yes. You will see reduced limescale in kettles, showers, and pipes within weeks. Long-term savings come from more efficient boilers (less scale buildup), less detergent and soap usage, and fewer plumbing call-outs. Most households recoup the cost within 3-5 years.

What brands of water softener are available in the UK?

The main UK brands include Harvey, Kinetico, Monarch, Tapworks, and Culligan. Each has different strengths: Harvey and Kinetico are non-electric twin-tank designs, Monarch offers good value mid-range options, and Tapworks specialises in compact under-sink units. We request quotes from installers who work with major UK brands. The number of quotes you receive depends on installer coverage in your postcode area.

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