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Not all machines boil the water, in fact most do not boil the water used for brewing. They will all hit 90-97 though, depending on the temp control used.
I have no idea whether ecoli is reduced by boiling is self or simply heating above a set temp. The easiest advice to give to the public will be to boil, as it's easily recognisable.
Health and safety teach that bacteria and germs start to die above 63deg.
But the common advice for ecoli seems to be boil for 1min.No easy answer I'm afraid.
Matisse
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?