Kettle is an instance of a Vessel aggregrated with a heater and temperature sensor
Methods
Here is the formula for evaporation losses
kW = 3067 x (Hsat - Hamb)
with:
Hsat: specific humidity of saturated air at the temperature of the water (g water / kg air)
Hamb: specific humidity of ambient air at the temperature of the water (g water / kg air)