Standard split-phase power is 120/240V, not 220V. The extra 10% will impact heating element life.
Many marinas are actually 208 because they're taking from a three-phase drop. This is DONE WRONG but it is done all the time. The proper way to do that is to use a transformer to feed 120/240V split-phase from the 3-phase feed but those cost money and we know how much marinas like to spend money, right? Thus the 208 feed which they deem "good enough." This can (and sometimes does) damage AC compressors and other 240V loads, especially when you also get voltage sag due to insufficient wire diameter, poor connections and other similar ills that are common at marinas. I've seen 190V on a supposed "240V" feed when traveling before under load on the end of the "T" dock, and there's no way in hell I allow my AC units (or my refer!) to run off such power - I run my genset as while the diesel costs money compressors and refrigerators cost more money.
I'd contact the machine manufacturer. It is a near-certainty that they have the proper instructions and heating element for a 240V US installation for that unit. The pump motor PROBABLY won't care (it will run a bit fast if its a rotary pump but an espresso machine's pump pressure is regulated not by the pump but by a pressure-regulating valve and as such the unit's operation should be unaffected by this. If its a vibratory pump it likely won't care at all. Push comes to shove if its a vibratory pump they are available inexpensively - Ulka makes the pumps in 90% of the machines out there, with procton making most of the rotary vane pumps. Rotary pumps, however, are expensive.)
BTW if/when I find my "dream 58YF" and buy it one of the things that IS going in that boat is a high-quality rotary-pump espresso machine similar to the one I have at home. I consider that thing a necessity of life.
