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240V 100A main breaker is basically the minimum you'll see in residential homes in the USA. 240V 200A is basically the standard in homes 70s or newer.
The house I lived in in Florida was ~3Ksqft. NO gas in the neighborhood so everything was electric. Two different electric heater/Air-conditioning units (each handled it's own floor), water heater, separate built in stove/oven, swimming pool pump, pool heater, hot tub, dryer and an outlet for a welder in the garage all powered off 240V.
Every breaker spot in our panel was occupied...I don't think it was possible to add a circuit to it.
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