Smarter Heating & Hot Water

Heat Output (KW) to Flow Rate (LPS/LPM)

Calculate the required flow rate for your heating system based on heat output, temperature difference, and specific heat capacity.

Heat Output (KW) 24
Temperature Difference Δt (°C) 35
Specific Heat Capacity (kJ/kg·K) 4.186
Flow Rate
0.1637
litres per second (LPS)
Flow Rate
9.8214
litres per minute (LPM)
Flow Rate
589.2857
litres per hour (LPH)

Formula Reference

LPS = KW / (SHC × Δt)
LPM = LPS × 60
LPH = LPS × 3600

KW = Kilowatts (heat output)
SHC = Specific heat capacity (kJ/kg·K)
Δt = Temperature difference (°C) between flow and return

Important: This calculator provides indicative flow rate guidance only. Always consult with a qualified heating engineer for your specific installation requirements.