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With Copper Boiler(s)

Copper is the most common boiler material on prosumer home espresso machine and is usually what is used on espresso machines above $1000. They have much better temperature stability and are more durable than brass or aluminum boilers typically found on lower cost machines. Some people are concerned about copper leaching into the water, but essentially all current copper boilers have nickel plating inside the boiler to prevent leaching.