Executive Summary: Sector DA13 0 vs Sector SW1A 1
Comparing tap water mineral concentration between Sector DA13 0 (Southern Water) and Sector SW1A 1 (Thames Water) reveals a water hardness difference of 5 PPM. Sector SW1A 1 has softer water at 275 PPM (Hard) compared to Sector DA13 0 at 280 PPM (Hard).
Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector DA13 0 experience higher heating element degradation and kettle scale accumulation due to elevated calcium carbonate density (280 PPM vs 275 PPM).
For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector DA13 0 requires setting H04 whereas Sector SW1A 1 recommends setting H04.