Executive Summary: Sector SN10 4 vs Sector SW1A 1
Comparing tap water mineral concentration between Sector SN10 4 (Wessex Water) and Sector SW1A 1 (Thames Water) reveals a water hardness difference of 15 PPM. Sector SW1A 1 has softer water at 275 PPM (Hard) compared to Sector SN10 4 at 290 PPM (Hard).
Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector SN10 4 experience higher heating element degradation and kettle scale accumulation due to elevated calcium carbonate density (290 PPM vs 275 PPM).
For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector SN10 4 requires setting H04 whereas Sector SW1A 1 recommends setting H04.