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 SW1A 1 vs Sector B1 1

Comparing tap water mineral concentration between Sector SW1A 1 (Thames Water) and Sector B1 1 (Severn Trent Water) reveals a water hardness difference of 115 PPM. Sector B1 1 has softer water at 160 PPM (Moderately 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 160 PPM).

For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector SW1A 1 requires setting H04 whereas Sector B1 1 recommends setting H02.

NP

Sector B1 1 has 115 PPM LOWER water hardness than Sector SW1A 1

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

Water Metric
Sector SW1A 1Outcode: SW1A
Sector B1 1Outcode: B1
Hardness (PPM)
275 PPM
160 PPM
Clark Degrees
19.3 °Clark
11.2 °Clark
Classification
Hard
Moderately Hard
Bosch Salt Setting
H04
H02
Water Supplier
Thames Water
Severn Trent Water
Postcodes Covered
66 postcodes
125 postcodes