DECIDING ON THE REQUIRED BOILER WATER TDS

# Boiler Type ; Maximum TDS (ppm)

• Lancashire ; 10,000 ppm
• 2 - Pass Economic ; 4,500 ppm
• Package and 3 - Pass Economic ; 3,000 - 3,500 ppm
• Low Pressure Water Tube ; 2,000 - 3,000 ppm
• Medium Pressure Water Tube ; 1,500 ppm
• Coil Boilers and Generators ; 2,000 ppm

The above figures are offered as a broad guide only, the boiler maker should always be consulted for specific recommendations.

Source - Spirax Sarco