UK's Top Domestic Water Softeners
How to Choose the Right Size
Softener sizing depends on household size and water hardness, not just budget. As a rough guide:
| Household size | Typical softener |
|---|---|
| 1 person | Compact / Micro (4L resin) |
| 2 people | Compact to mid-size (4–10L resin) |
| 3 people | Mid-size (10–15L resin) |
| 4+ people | 15L+ or high-capacity ECOULTRA range |
These are starting points — actual hardness, number of bathrooms, and whether you want to soften just drinking water or the whole house all affect the right size.
Use the household size filter below, or read our full sizing guide →
Not Sure How Hard Your Water Is
Free tool
Check your water hardness by postcode
Enter your postcode for an instant estimate of your local water hardness, your likely supplier, and what it means for your home.
That doesn't look like a UK postcode — try again with your full postcode or just the first part (e.g. SY13).
Results are estimated regional averages by postcode area, compiled from published water company hardness data and are not property-specific — supply zones can vary within a region. For an exact reading, check the supplier links further down this page.
Water Softeners and Private Water Supplies
Our Best Selling Water Softeners
Frequently Asked Questions













