This calculation does not take into account possible heat losses.
P = Power to install in kW
V = Volume to heat in liters (or dm3)
p = Weight in Kg/dm3
Vp = Weight to heat in Kg
t1 = Initial temperature in ºC
t2 = Final temperature in ºC
Cp = Specific heat in Kcal/Kg x ºC
T = Heating time in hours.
1.2 = Safety factor considering tolerance on sector voltage and resistance ohmic value.
| 
 | 
W/Cm2 = Surface load W/cm2
P = Power of the heating cartridge (W)
S = Surface (cm²) = diameter (units in cm)
| W/Cm2 = | P | 
| S | 
Scientific notation calculator
V = Voltage (V)
I = Current (I)
W = Power (W)
R = Ohms (R)
| Ohms (R) = | V | 
| I | 
| Ohms (R) = | V * W | 
| Ohms (R) = | W | 
| I2 |