Not quite sure how to calculate it, but a n2-highmem-128 instance running at near peak for 24 hours surely uses more electricity than the energy required to heat a dozen or two gallons of water per day.
https://cloud.google.com/blog/topics/sustainability/clean-en...
In 24 hours it consumes about the same amount of energy (2.5kW * 24h = 60 kWh) as charging a Model 3 LR's battery from 0 to 75%. So definitely more than heating up two dozen gallons of water even to boiling temperature (8 kWh), but still within the realm of household consumption with EVs.