Best Way to Reheat Coffee: 5 Methods Compared

A steaming cup of freshly brewed coffee is an experience many of us cherish, an invitation to awaken our senses and start our day on a high note. But life doesn’t always allow us to enjoy our brew in one sitting. Interruptions can cause our perfect cup to grow cold and seemingly lose its charm. Many of us wonder, can we simply reheat it? Does it affect the flavor? Is it even safe to reheat coffee? This guide is set to explore these questions, shed light on the best way to reheat your coffee, and provide tips to maintain its flavor and aroma.

Understanding the Basics

Why You Might Need to Reheat Coffee

Life is full of unexpected moments. Maybe your boss called you for an immediate meeting or your child needed help with homework. Suddenly, your once steaming mug of coffee is left neglected, only to turn cold. Instead of tossing your cooled coffee, reheating becomes a practical and economical solution.

When reheating coffee, the type of beans used, such as Arabica or Robusta, can influence the flavor outcome. Arabica beans, known for their sweet and complex profile, may have their delicate flavors altered more than the stronger, earthier Robusta when reheated. Thus, for a better reheating experience, a robust, darker roast with Robusta beans might be more forgiving than a lighter, nuanced Arabica blend.

The Science Behind Coffee’s Flavor & What Happens When It Cools

Coffee owes its captivating flavor to hundreds of compounds that form during roasting. When coffee cools, or worse, when it is reheated, some of these compounds can change or evaporate, thereby altering the original taste. It’s crucial to understand the chemistry of coffee to unlock the best way to reheat it without compromising its inherent aroma and flavors. This understanding also sets the foundation for exploring the best reheating methods, which we’ll delve into in the next sections.

Common Misconceptions about Reheating Coffee

reheat coffee, how to reheat coffee

There are numerous misconceptions that surround the concept of reheating coffee. These myths often influence our decision about whether to reheat that cup of joe or simply pour it down the drain. Let’s debunk some of these common misconceptions:

1. Reheated Coffee is Unhealthy

One of the most common myths about reheating coffee is that it is unhealthy. Contrary to this belief, reheating coffee does not inherently make it unhealthy. While it’s true that the flavor and aroma might change due to the evaporation or alteration of certain volatile compounds, the nutritional profile of your coffee essentially remains the same. However, repeatedly reheating the same coffee multiple times could potentially increase the risk of bacterial growth, so it’s always advisable to consume your coffee within a reasonable timeframe.

2. Reheating Coffee Makes It Acidic

Some people believe that reheating coffee makes it more acidic, hence bad for your stomach. While coffee does contain natural acids, these acids contribute to its unique flavor profile and are present whether the coffee is cold, hot, or reheated. Re-heating your cup of coffee, does not increase the acidity.

3. All Reheating Methods Ruin the Flavor

Another misconception is that all reheating methods negatively impact the flavor of the coffee. While certain methods like using a microwave might result in uneven heating, other methods can be quite effective. For instance, reheating coffee over a stovetop on low heat can often preserve most of its original flavor and aroma.

Armed with a better understanding of these misconceptions, we can explore various reheating methods with a clear mind. In the upcoming section, we’ll delve into the best ways to reheat your coffee, each with its unique pros and cons.

Detailed Guide to the Best Methods for Reheating Coffee

When it comes to reheating coffee, several methods come to mind. But what is the best way to reheat coffee? Let’s explore each of them, along with their pros, cons, and steps to achieve the best results.

MicrowaveQuick, convenient, requires no additional equipmentCan result in uneven heating, may alter flavor if overheatedPour coffee into a microwave-safe cup, set the microwave to medium power, heat for 30 seconds, stir and check the temperature, repeat in 10-15 second increments until desired temperature
StovetopProvides even heating, allows for better temperature controlTakes more time than a microwave, requires continuous monitoringPour coffee into a pot, heat it on low to medium heat, keep stirring for even heating, remove from heat when desired temperature is reached
OvenCan heat larger amounts of coffee at onceTakes longer, not as energy efficient, risk of overheatingPreheat oven to 200°F, pour coffee into an oven-safe container, heat for about 15 minutes, regularly check temperature
Immersion HeaterPortable, convenient, ideal for offices or travelMay not heat evenly, could be a safety hazard if not used properlyPlace the immersion heater in the cup, plug in the heater, keep an eye on the coffee, unplug before removing the heater
Specialty Coffee WarmerMaintains a consistent temperature, designed for optimal heatingRequires additional cost, not portablePlace cup on the coffee warmer, turn the device on, let coffee heat up to the set temperature


The microwave is a go-to solution for many when it comes to reheating food and beverages, including coffee.


  1. Pour your coffee into a microwave-safe cup.
  2. Set your microwave to medium power.
  3. Heat the coffee for 30 seconds.
  4. Stir and check the temperature.
  5. Repeat in 10-15 second increments until desired temperature is achieved.


Reheating coffee on the stovetop is another common method that many coffee enthusiasts swear by.


  1. Pour your coffee into a pot.
  2. Heat it on low to medium heat.
  3. Keep stirring the coffee to ensure even heating.
  4. Remove from heat once it reaches the desired temperature.


While not as common as the microwave or stovetop, the oven can also be used to reheat coffee.


  1. Preheat your oven to 200°F.
  2. Pour your coffee into an oven-safe container.
  3. Place the container in the oven and heat for about 15 minutes.
  4. Check the temperature regularly to avoid overheating.

Immersion Heater

An immersion heater is a portable device used to heat liquids, including coffee.


  1. Place the immersion heater in your cup of coffee.
  2. Plug the heater into an outlet.
  3. Keep an eye on the coffee until it reaches the desired temperature.
  4. Unplug the heater before removing it from the cup to avoid burns.

Specialty Coffee Warmer

A coffee warmer is a device specifically designed to keep coffee at the perfect temperature. If you are on a budget, we recommend this compact desk coffee warmer.


  1. Place your cup of coffee on the coffee warmer.
  2. Turn the device on.
  3. Allow the coffee to heat up to the set temperature.

By understanding the pros and cons of each method, you can choose the one that suits your circumstances the best. In the following section, we’ll provide some tips to maintain the flavor when reheating your coffee.

Tips to Maintain Flavor When Reheating Coffee

As we’ve established, reheating coffee can alter its flavor. However, with these tips, you can minimize this impact and enjoy your coffee even after reheating:

  • Don’t Overheat: Overheating coffee can lead to a burnt taste. It’s best to aim for around 155-175°F, a temperature range that keeps your coffee hot without destroying its flavor.
  • Reheat Only What You’ll Drink: Reheating the same coffee multiple times can significantly alter its taste. Only reheat the amount you plan to drink.
  • Cover Your Coffee: Cover your coffee while reheating to prevent evaporation of volatile compounds that contribute to its flavor.
  • Avoid Delay: Coffee’s taste alters over time. The sooner you reheat and drink it, the closer it will be to its original taste.


How long is it safe to drink reheated coffee?

Coffee is best consumed within a couple of hours after brewing. If kept at room temperature for more than 2 hours, bacterial growth could potentially occur. Always store leftover coffee in the fridge to keep it safe for consumption.

Does reheating coffee make it more acidic?

The perceived acidity of coffee is related to its temperature, but reheating doesn’t change the actual pH or make it more acidic.

Can you reheat coffee with milk?

Yes, you can, but be cautious. Dairy products have a risk of spoiling under certain conditions. It’s safest to reheat coffee with milk just once.

How many times can you reheat coffee?

For the best flavor, it’s advisable to reheat coffee only once. Multiple reheating can lead to a significant loss of flavor and potential bacterial growth.

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