Once upon a time at an unnamed company in an unnamed city, a coffee company opened a new café. They had exotic tastes in espresso machines and had purchased a beautiful, completely unheard-of model directly from a boutique European manufacturer. The crate was opened with care, the machine lifted onto the counter, and the whole staff gathered around to admire it.

“Hey,” said a bright young barista. “That machine doesn’t have a UL sticker on it.”

And at that angst-filled moment, the manager of the new café suddenly got very curious about UL. Could the machine be installed? Was it legal? Was it safe? And what, just exactly, was UL?

In any system where steam is generated, there is always a possibility that over-pressurization can cause a catastrophic failure of the pressure vessel. This could result in destruction of property, injury, and loss of life. This is a bad day no matter how you cut it.

Learn about the good old pressure relief valve, and how it can save you and your espresso machine a whole load of bother.

It’s exciting to see so much interest in the testing and reporting of water quality among technicians these days. Let’s talk about what a TDS meter actually is, what is measures, what it doesn’t measure, and how to make the most of yours.