The Metal Fatigue Argument

One common belief is that espresso machines should remain on continuously. Supporters of this idea argue that the constant heating and cooling of metals like copper and stainless steel—found in boilers and other components—causes expansion and contraction. Over time, they say, this movement weakens the metal, leading to stress and fatigue.

From this point of view, keeping the machine hot is a way to reduce wear and extend the life of the unit.

The Gasket Preservation Approach

Others argue that turning your machine off can actually help preserve key components—specifically, internal gaskets and O-rings made of rubber or silicone.

When left on, a machine cycles heat constantly to maintain brewing temperature. This ongoing heat exposure can dry out these soft materials, causing them to become brittle and crack. That leads to steam and water leaks, costly repairs, and earlier-than-expected maintenance.

What I’ve Seen in the Field

In my experience, metal fatigue from heating and cooling is a non-issue. I’ve never seen a boiler fail because it was turned off at night. What does wear espresso machines down? Water—specifically, poor water quality filled with minerals, scale, and acid. That’s what ruins components far faster than any on/off cycling.

Most of today’s commercial machines include programmable on/off timers. If yours has one, use it. If not, consider your routine and decide what makes the most sense for your business.

Setting Up an On/Off Program

If you do have a programmable timer, set it to turn your machine on at least 60 minutes before opening—or whenever you plan to start making drinks. While steam pressure typically builds within 10 to 20 minutes, the group heads take longer to fully heat up and stabilize. Skipping that warm-up time can lead to inconsistent shots.

If your machine doesn’t have this feature, and you know mornings are busy, it might be best to leave your machine on overnight. The peace of mind is worth it when you're juggling prep, staffing, and customers during those crucial early hours.

Final Thoughts

There’s no one-size-fits-all answer. Whether you leave your machine on or off depends on your specific setup, schedule, and maintenance practices. But if you’re concerned about longevity, focus more on water quality and gasket care than the myth of metal fatigue.

by David Easley
Inland Coffee and Beverage
Deer Park, Washington