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Remember that water has reached 100 degrees when boiling at atmospheric pressure. Espresso machine boilers generally operate under pressure, apart from certain types of lever machines. I think you'll likely have killed Ecoli either way; find out the actual temp that kills them.
Stovetop pots definitely reach boiling point.
rodabod
Here's one for the mavens: my city is currently under a boil water order due to 2 tests that came back a couple of days ago showing the possible presence of E. coli. Subsequent tests haven't turned up anything, though the order still stands due to not confirming the source or whether it was a lab error.
Is my local safe to order from? Do commercial espresso machines heat the water above the boiling point before bringing it back down to the sweet spot?