3

It's likely connected there to ensure only cold water goes to the gauge. Over time, hot water would negatively affect the gauge and, in a capillary tube, more rapidly deposit minerals and clog.


2

Our Mr Coffee Espresso machine is 3 years old. A great little machine, but the coffee drip started coming out VERY slowly. We cleaned it throughly but to no avail. Then we finally tried a mixture of 3/4 c. water to 1/4 cup vinegar (3:1) through a cycle and after what sounded like a sudden "poof" IT WAS FIXED! There was something clogged in there, ...


2

This is a typical moka pot. The confusion may stem from the fact that the principle of a moka pot is somewhat similar to a percolator, just without a back flow (sort of a “one way percolator”), and in some descriptions, including the German Wikipedia article on moka pots, the expression “percolator” is used.


2

Flushing helps clear any residue that might be left inside the machine or grinds stuck to the group screen before pulling your next shot. It also helps bring the group head up to temp before you lock the portafilter, so your first bit of hot water doesn't get cold as soon as it hits your puck.


2

You will need to grind a lot finer with the non-pressurised baskets. With a pressurised filter basket, the resistance is mostly produced by the one tiny hole in the filter basket. For non-pressurised ones, the coffee needs to provide the resistance. If the grounds fail to provide enough resistance, the water will run through the coffee really fast, probably ...


2

To me, this sounds like channeling. When you brew espresso the machine pushes water through a puck of compressed coffee grounds. Ideally, the grounds are distributed equally throughout the puck so that the water passes through the puck evenly. In reality, there will always be small inconsistencies. These inconsistencies allow water to move through slightly ...


2

Coffee brewing is simple physics and chemistry. In short, soluble compounds and oils migrate from the beans to the water. The extraction will depend on temperature, pressure and contact area between beans and water. There’s also a balance between desired and less desired flavor compounds (e.g. acidic and bitter) that a specific brewing method needs to manage,...


2

Reviews of the Melitta Molino indicate that the unit is not actually capable of achieving the very fine grind needed for espresso. Sorry to be the bearer of bad news. Espresso grinders require very tight tolerances in manufacturing to enable the close proximity of burrs required for very fine grinding. This is why the vast majority of grinders made by ...


1

This can happen if the gasket around the group head is damaged or worn out. Damage can occur if you overtighten the portafilter when locking it in place to brew, and wear occurs just by using the machine normally. Under normal use (once daily at least five days a week), a group head gasket will need to be replaced about every six months.


1

You probably have a broken shower (dispersion disc). Try removing the shower screen - the metal part that faces the coffee. There's a screw in the center. Above the screen is a plastic dispersion disc (shower); it's job is to spread the water across the bed of coffee. Remove it as well - should pry right out, no additional screws. It's pretty common for this ...


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