How much power does it consume to operate?Updated 6 months ago

That depends on how hard it has to work. The power supply is 12 volt DC, rated at 12.5A but the aF4 typically does not need all that power. It uses the most electricity when bringing the reservoir to temperature, the rest of the time it uses significantly less power.
On average in a 70F ambient temperature house, the aF4 consumes approximately 2 kWh per day. This number will decrease with cooler ambient temperatures and increase with warmer ambient temperatures.