We just upgraded our lines from the street from 100A to 200A (at 240V) so that pair of wires can support around 48KW. I think my stove is 20A at 240V so the fat

We just upgraded our lines from the street from 100A to 200A (at 240V) so that pair of wires can support around 48KW. I think my stove is 20A at 240V so the fattest wire in the house protected by a breaker can safely handle around 4.8KW. On the 120 side the biggest wire I've got is 20A, so 2.4kw. Many house receptacles are only 15A max, hence your 1.8kw.