t = V x Δ T x K
60 x W where:
t = Heating time (minutes)
V = Total liquid volume (litres L)
ΔT = Temperature difference (ºC)
K = Liquid heat capacity (J/L/ºC)
For water: K = 4200
For silicone oil: K = 1680
W = Heating power (Watt)
Example: A 12 litre bath containing water with a thermostat of 1400 W heating capacity can raise the temperature from +20ºC to +56ºC in 21.6 mins.
t = 12 x (56 -20) x 4200 = 21.6 mins
60 x 1400
