Executive Summary: Sector PO39 0 vs Sector SW1A 1
Comparing tap water mineral concentration between Sector PO39 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 PO39 0 at 280 PPM (Hard).
Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector PO39 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 PO39 0 requires setting H04 whereas Sector SW1A 1 recommends setting H04.