Your Auto-Drip Coffee Maker Probably Doesn't Get Hot Enough, And It Shows In The Taste

For hardcore coffee nerds, there are seemingly countless types of coffee machines and endless methods to press, pump, and pour water through coffee grounds to get that perfect cup. Humble auto-drip coffee makers are there for everyone else, providing a low-effort, often more affordable way to get a big ol' pot ready when you need it most. If you're in the camp of people with one foot in the coffee nerd group and the other in the "I just want some easy coffee" crew, you may find that your drip coffee machine isn't quite delivering the results you'd like. A common problem is that your drip coffee maker isn't getting the water hot enough.

The generally accepted best temperature for brewing coffee is just below boiling point, between 195 and 205 degrees Fahrenheit, which most drip coffee makers (except for a few that are certified by the Specialty Coffee Association of America) don't actually reach. The reason this matters is that if your water temperature is too low, you're likely under-extracting your coffee. When you pour or drip hot water over ground coffee, it strips out oils, acids, caffeine and water-soluble flavor compounds that give the coffee its desirable flavors. Rather than just being bitter, in well-extracted coffee you get a balance of sweetness, acidity, body, and a range of fruity, earthy, or floral flavor profiles that can be as diverse as in wine. Water too far below 195 degrees doesn't extract as much of those flavorants, resulting in a brew that tastes sour or flat, and lacks body.

If completely replacing your auto-drip coffee machine is too drastic a step, then you can make some tweaks to get a better cup of joe from the same unit. While there's some discussion circulating about using already-heated water in your machine to make a hotter cup, it's not likely your machine will actually get that water any hotter, because they're calibrated to heat water to a particular range. It'll just percolate it faster.

If your water is not up to temperature because your machine takes too long to heat up, you can preheat the water circuit by running the machine with only water, and no filter or coffee. This allows the element to heat up ahead of your actual brew process, which can help reach a higher temperature for the full extraction.

The other alternative is to adjust your coffee choice to suit a cooler extraction better. Darker roasts benefit from lower brewing temperatures, as this makes it easier to prevent over-extraction, which can result from the higher level of bittering compounds that you get from the extra roasting.