Smarter Heating & Hot Water

Heating System Water Content Calculator

Calculate the approximate water content of center radiators for system sizing and chemical dosing.

300
Water Content
0.84
Litres (L)

Formula

Water Content (L) = (Length mm / 1000) × Type Factor

Length = Radiator length in millimeters
Type Factor = Water content factor based on radiator type and height

Type factors range from 2.8 (Type 11 - 300mm) to 9.9 (Type 21/22 - 700mm)

Important: This calculator provides approximate water content for center radiators. Actual values may vary by manufacturer. Use for system volume calculations and chemical inhibitor dosing. Always consult radiator specifications and a qualified heating engineer.