Side-by-Side Water Hardness Calculator

Compare Water Hardness

Analyze real-time PPM, Clark degrees, limescale risk, and dishwasher salt settings between any two UK postcode sectors.

Water Quality Comparison Analysis

Executive Summary: Sector RG45 7 vs Sector SW1A 1

Comparing tap water mineral concentration between Sector RG45 7 (South East Water) and Sector SW1A 1 (Thames Water) reveals a water hardness difference of 5 PPM. Sector RG45 7 has softer water at 270 PPM (Hard) compared to Sector SW1A 1 at 275 PPM (Hard).

Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector SW1A 1 experience higher heating element degradation and kettle scale accumulation due to elevated calcium carbonate density (275 PPM vs 270 PPM).

For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector RG45 7 requires setting H04 whereas Sector SW1A 1 recommends setting H04.

NP

Sector RG45 7 has 5 PPM LOWER water hardness than Sector SW1A 1

Lower PPM indicates softer water, reduced limescale risk, and lower detergent usage.

Water Metric
Sector RG45 7Outcode: RG45
Sector SW1A 1Outcode: SW1A
Hardness (PPM)
270 PPM
275 PPM
Clark Degrees
18.9 °Clark
19.3 °Clark
Classification
Hard
Hard
Bosch Salt Setting
H04
H04
Water Supplier
South East Water
Thames Water
Postcodes Covered
167 postcodes
66 postcodes