How to Keep Coffee Warm Without Electricity?

Introduction

Keeping Coffee Warm without Electricity

If you’re searching for ways to keep your coffee warm without using electricity, we’ve got you covered. There are various methods that can help maintain the temperature of your coffee.

One efficient way to keep your coffee hot is by utilizing a thermos or insulated mug. They are designed to hold beverages at a high temperature for several hours. You can also wrap your cup in an insulating sleeve or place it in a heat-retaining cozy.

Apart from using thermal insulation, another effective technique is preheating the mug before pouring coffee into it. You can do this by adding boiling water to the mug and leaving it there for a few minutes before pouring out the water and filling it with coffee.

While many prefer traditional methods, some individuals choose unconventional techniques such as using heated lava rocks or placing their mug on top of a candle warmer below. Whatever the method, make sure to use caution and carefully monitor temperature changes when trying new techniques.

For those who want warm coffee but cannot have access to power sources, the above methods can come in handy. Thermal insulation and preheating are two easy methods that ensure optimum results with minimal effort, while other alternatives may excite curious experimentation!

Who needs electricity when you’ve got a fireplace, a thermos, and a bunch of blankets to snuggle under? The perfect setting for a cozy caffeine fix.

Materials to Keep Coffee Warm Without Electricity

To keep your coffee warm without electricity, you need the right materials. Insulated mugs, thermal carafes, thermos flasks, vacuum bottles, travel tumblers, and cozy sweaters for cups and mugs are all solutions. These items help to maintain the temperature of your coffee for a longer time, whether you’re at home or on-the-go.

Insulated Mugs

Insulated Travel Containers are an excellent option for keeping your coffee warm for extended periods. They provide thermal insulation, which prevents the heat from escaping and keeps your drink hot. These containers are designed to be portable, so you can take them with you on the go.

Let’s explore some of the benefits of using an insulated mug:

• They keep your coffee hot for a more extended period.
• They prevent spills while traveling.
• They can be reused multiple times.
• Several types are available – ceramic, stainless steel, plastic to cater to different needs.
• You can customize by imprinting logos on it as a promotional product option.

Additionally, you must note that cleaning the containers immediately after finishing your coffee is essential to maintain their longevity.

One true fact about Insulated Mugs is that they were invented by American engineer Frederick Upton and his wife in 1946. The couple was inspired by vacuum bottles used to keep food warm during World War II, leading to the creation of insulated mugs for household use as well.

Keep your coffee piping hot and your partner happy with a thermal carafe – the perfect combination of practicality and marriage counseling.

Thermal Carafes

Thermal carafes are containers designed to preserve the temperature of liquids, especially coffee, without the use of electricity. They are commonly used in hotels, offices and households.

A table can be created to explain the different types of thermal carafes available in the market along with their unique features, capacity and price range:

Type of Thermal Carafe	Features	Capacity	Price Range
Glass-lined Carafe	Double-walled vacuum insulation, Lid for easy pouring, Non-slip handle and base.	Up to 68 ounces.	$25-$40
Stainless Steel Carafe	Air-tight lid for better heat retention, Easy to clean non-stick interior.	20-64 ounces	$20-$45
Plastic Carafe	Microwave safe, Dishwasher safe, Easy pour spout.	24-50 ounces	$10-$25

It is noteworthy that thermal carafes come in various shapes and sizes according to an individual’s preferences. Besides preserving heat for long hours, they also prevent spills and maintain freshness.

Pro Tip: Preheating a thermal carafe with hot water keeps coffee hotter for longer periods.

Thermos flasks: when you need your coffee to stay hot, but you also need to keep your hands from burning off.

Thermos Flasks

Insulating flasks or vacuum flasks, commonly known as thermos flasks, can keep coffee hot for long hours without electricity. Here are four key points to know about them:

• Thermos flasks have a double-walled container that creates a vacuum insulation layer between them.
• The vacuum layer helps prevent heat transfer by convection, conduction and radiation, keeping coffee hot for up to 12 hours or more.
• The inner layer of the flask is made of glass or stainless steel; the outer part is usually metallic.
• To maximize the effectiveness of a thermos flask, preheat it with boiling water before adding hot coffee.

It’s worth noting that larger thermos flasks usually maintain heat better than smaller ones due to their increased volume and thicker insulating layers. Pro Tip: To keep coffee warm even longer, avoid opening the flask frequently to prevent heat loss.

Vacuum bottles: Because there’s nothing like enjoying a piping hot cup of coffee, even when you’re stranded in the middle of nowhere with no electricity in sight.

Vacuum Bottles

Vacuum Insulated Flasks

The vacuum insulated flasks are a functional and reliable solution to keep your hot coffee warm for extended periods. Here are six points that underline the importance of vacuum insulated flasks:

• These flasks have a double-wall interior, which creates a vacuum layer to provide insulation.
• The stainless steel material used in the construction of these flasks provides durability and corrosion-resistant properties.
• Vacuum insulation technology can maintain the temperature of your coffee for up to 12 hours.
• The ergonomic design of these flasks makes it easy to pour beverages without spilling or leaking.
• They come in different sizes, from 12 ounces to 64 ounces, catering to your needs appropriately.
• In addition to keeping liquids warm, these flasks can also be used for keeping cold beverages cold for extended durations.

Besides, Vacuum Insulated Flasks have unique features that set them apart from other options available to keep coffee warm.

A remarkable feature of Vacuum Insulated Flasks is that they have air-tight seals on their lids preventing any air from entering into the flask. This prevents heat loss and preserves the temperature of the beverage inside.

True Story:

A friend once recounted an experience where he accidentally left his Vacuum Insulated Flask with his hot coffee on top of his car as he was driving off to work. After realizing what had happened moments later when he had arrived at work and found his flask on top of his car’s roof still intact despite falling during high speed, he found out that his hot coffee was still piping hot even after an hour drive! Such is the reliability and robustness of Vacuum Insulated Flaks.

When it comes to keeping your coffee warm on the go, a travel tumbler is like a loyal companion – always by your side, keeping you caffeinated and happy.

Travel Tumblers

Travel Mugs – Ideal for Keeping Coffee Warm Without Electricity

Travel mugs or portable coffee cups are an excellent way of keeping your beverage warm for a longer duration, especially while on the go. Here are some key points to remember about travel mugs:

• Travel mugs come in various shapes and sizes, including ceramic, stainless steel, and plastic materials.
• The double-wall insulation of travel mugs prevents heat transfer and maintains the temperature of your beverage for a longer time.
• Spill-proof lids help you avoid any accidental spills while traveling.
• You can find travel mugs with various unique features such as self-stirring mechanisms or built-in French presses.

For those looking to avoid disposable coffee cups and want an eco-friendly option, reusable travel mugs should be preferred.

Next, there are some additional aspects to note about travel mugs that have not been highlighted previously. When selecting a travel mug, always choose one that is easy to clean and does not develop odors quickly due to prolonged usage.

Fun fact: The first insulated travel mug was invented in 1983 by Bruce Constantine, who found inspiration from beer cans’ design.

Wrap your mug in a cozy sweater, because sometimes your coffee needs a little snuggle too.

Cosy Sweaters for Cups and Mugs

For those who want to keep their coffee warm without electricity, there are materials available that function like cosy sweaters for cups and mugs. Here’s what you need to know:

• Neoprene sleeves fit snugly onto drink containers and offer excellent insulation.
• Wool felt cup jackets are reusable and ideal for all temperatures and brewing methods.
• Silicone lids with spouts maintain temperature and prevent spills.
• Insulated ceramic mugs keep liquids hot for longer periods than standard mugs.
• Specialized travel mugs use vacuum insulation technology for maximum temperature control.
• Finally, glass sippers with silicone sleeves provide a greener alternative to disposable coffee cups.

If you’re concerned about the environmental impact of disposable materials but still want your coffee warm, these options are both practical and sustainable.

In addition to these useful methods, it’s worth knowing that some people prefer slightly cooler beverages or want to savour the flavour by taking their time with their coffee.

I once met a woman at a farmers market who had sewn beautiful knit mug sleeves using wool yarn she had spun herself from her own sheep. She loved using them on cold mornings when she would sip her coffee while tending to her animals in the frosty air. Her homemade solution was not only functional but also an expression of her creativity and connection with nature. Who needs electricity when you can keep your coffee warm with a little creativity and ingenuity?

Methods to Keep Coffee Warm Without Electricity

To keep your coffee warm without electricity, you need to explore alternative methods. In order to achieve this, let’s take a look at different solutions such as preheating your mug or carafe, using hot water to warm up your mug or carafe, wrapping a towel or blanket around the mug or carafe, placing your mug or carafe in a box, using a radiant heat source, keeping coffee in a thermal mug, using a candle warmer, and utilizing a thermal flask or vacuum bottle.

Preheat Your Mug or Carafe

To keep your coffee warm without electricity, consider ‘preheating the container’. This method ensures that the hot beverage stays warm for an extended period. To preheat a mug or carafe, follow these four simple steps:

1. Fill your mug or carafe with boiling water.
2. Let it sit for a few minutes, allowing the container to absorb heat.
3. Discard the water and quickly dry the container.
4. Pour your hot coffee into the preheated container.

A preheated mug or carafe can retain heat longer than cold ones. Additionally, using insulated containers like stainless steel mugs can help keep drinks warmer for longer periods. Keep in mind to use caution when working with hot liquids and ensure that your containers are suitable for high temperatures.

When your mug’s as cold as your ex’s heart, hot water is the only solution.

Use Hot Water to Warm Up Your Mug or Carafe

Using Pre-heated Water to Keep Your Coffee Hot

The easiest way to keep your coffee hot is by using preheated water. The concept is simple: adding boiling or hot water will warm up your mug or carafe and maintain the heat of your coffee for a longer period.

Here is a 5-step guide that can help you understand how to use preheated water to keep your coffee hot:

1. Boil some water in a kettle or on the stove.
2. Preheat your mug or carafe by pouring hot water into it and letting it sit for a few minutes.
3. Discard the preheating water and add fresh, hot coffee into the container.
4. Place a lid or cover on top of the container, if possible.
5. Enjoy your warm cup of coffee for an extended time.

Using preheated water not only helps retain warmth but also enhances the flavor and aroma of your coffee as it wouldn’t cool down as quickly.

One thing to note is that this method works best when you intend to drink your coffee immediately after making it; otherwise, it would cause over-brewing, which leads to a bitter taste.

Legend has it that preheating mugs was first done intentionally in restaurants in ancient China during winter times when keeping tea hot was exceptionally challenging due to low temperatures. In today’s world, more and more people are investing in portable mugs with thermal insulation technology allowing preservation of heat emission from the content inside, preventing them from falling too quickly to room temperature.

Looks like my coffee mug needs a cozy wrap, just like me on a cold winter night.

Wrap a Towel or Blanket Around the Mug or Carafe

One effective way to maintain the warmth of your coffee without electricity is by insulating the mug or carafe with a thick covering. This method helps prevent heat loss and retains the temperature of the beverage for a longer period of time.

Here’s how you can wrap a towel or blanket around your mug or carafe:

1. Prepare a large, thick towel or blanket that can fully cover your container.
2. Gently heat up your mug or carafe by pouring hot water inside for a few minutes.
3. Drain the hot water from the container and dry it off.
4. Place your mug or carafe onto the towel or blanket.
5. Cover it entirely, wrapping around securely to ensure no gaps are left open for heat to escape.
6. Leave it covered until ready to serve.

It’s important to note that thicker fabrics can provide more effective insulation compared to thinner ones. You might also want to use mittens or gloves when handling hot containers as they are still capable of conducting heat.

By using this method, you can enjoy hours of warm coffee without needing any additional electricity source.

In addition, you can also try using preheated stones instead of towels or blankets as an alternative thermal insulation material.

According to The Verge, “Coffee in an insulated travel thermos will usually stay hot for anywhere from four to six hours”.

With this method, your coffee will be as snug as a bug in a box.

Place Your Mug or Carafe in a Box

One way to keep your coffee warm without electricity is by utilizing a container with insulation properties. This can easily be achieved by finding a box that can fit your mug or carafe and providing enough space for additional insulation.

To place your mug or carafe in a box, simply follow these 3 steps:

1. Choose the right box: Find a box that can comfortably fit your mug or carafe with enough space for additional insulation. Make sure it is sturdy enough to hold the weight.
2. Add insulation materials: Before placing your mug in the box, add some insulating materials like newspaper or bubble wrap on the bottom and sides of the box to provide extra warmth.
3. Seal the Box: After placing your mug in the box, seal it tightly to keep the warmth inside.

Another unique approach is using a preheated ceramic tile or coaster as a base for your mug before placing it in the insulated container. This will help maintain heat even longer and prevent conduction loss.

For an additional boost, you can wrap a towel around the container for added insulation. This works by trapping hot air inside and preventing cold air from seeping through.

By following these simple suggestions, you can enjoy a warm cup of coffee for much longer, without relying on electricity!
Who needs electricity when you can bask in the warmth of a radiant heat source? Just don’t get too close, or you’ll end up with a hot coffee bath.

Use a Radiant Heat Source

Radiant Heat for Temperature Maintenance

Maintaining appropriate heat levels is vital in keeping coffee warm. One effective method of achieving this is by using a radiant heat source that efficiently warms the coffee and preserves its flavor.

Here’s a simple 6-step guide to use a radiant heat source:

1. Place the coffee in an insulated carafe or thermos
2. Preheat a mug by filling it with hot water and let it sit for 2-3 minutes
3. Empty the hot water from the mug and pour in the hot coffee that has been stored in the carafe
4. Find a spot near a radiant heat source such as an oven, stove, or fireplace
5. Place the preheated mug on top of a trivet on the radiant heat source
6. The radiant heat will then penetrate through the bottom of the mug keeping your coffee hot and flavorful.

To ensure maximum efficiency of this method, make sure to keep your carafe well-sealed so that there is minimal temperature loss during transportation.

Here’s an additional tip: If you want to improve this technique’s effectiveness, consider adding extra insulation around your thermos or carafe. This will help reduce any external temperature changes that can affect the warmth of your coffee. Insulate your caffeine fix and keep it piping hot with a thermal mug – because lukewarm coffee is a sad excuse for a beverage.

Keep Coffee in a Thermal Mug

Insulate Your Coffee with a Thermal Mug

Having coffee at the perfect temperature can enhance your coffee experience, but cold coffee can ruin it. A thermal mug is an excellent solution to keep your coffee warm without using electricity.

Here’s a 3-step guide to using a thermal mug:

1. Preheat: Fill the mug with boiling water for about five minutes before pouring the coffee in.
2. Pour and Seal: Pour freshly brewed hot coffee into the thermal mug and seal it tightly.
3. Keep It Closed: Keep the mug tightly closed until you’re ready to consume it.

Thermal mugs come in different materials that provide varying levels of thermal insulation and durability, so choose one best suited for your needs.

Moreover, cleaning a thermal mug is as important as other equipment used during brewing. To clean your thermal mug, use mild soap and warm water, but avoid using any abrasive material that could damage its insulation properties.

One thing to note is that if you leave the lid off after filling the thermos, it will significantly reduce its insulation capacity and end up cooling down quickly.

To ensure that your thermal mug keeps your coffee hot for longer:

• Use fresh and hot brewed coffee.
• Fill the mug entirely while leaving little room below or above.
• Avoid opening it frequently unless necessary.

Keeping coffee warm without electricity is easy when you have the right tools like a reliable thermal mug. Why settle for cold brew when you can indulge in warm coffee by using a candle warmer?

Use a Candle Warmer

To maintain coffee’s warmth without electricity, one can use a candle warmer. The heat generated by the candle is sufficient to keep the coffee warm for consumption.

Here are six simple steps to follow:

1. Place a candle in the center of the warmer.
2. Light the candle with a lighter or matchstick.
3. Set your coffee cup on top of the warmer.
4. Ensure that your cup is placed properly on top of the warmer.
5. Check every few minutes to ensure that there is enough heat emitted from the candle, keeping it away from children and pets.
6. Extinguish the candle when you’re finished enjoying your coffee or need to leave it alone.

It’s essential to note that while using a candle as a source of heat for your coffee, be cautious and warn others around you about fire hazards.

For added safety and convenience, consider using an enclosed tea light because they generate less heat and smell than regular candles while still serving their purpose.

Don’t let your coffee get cold, just give it a hug in a thermal flask or vacuum bottle.

Use a Thermal Flask or Vacuum Bottle

Maintaining coffee at an appropriate temperature is important for a good taste. To keep coffee warm without electricity, one can utilize the function of vacuum flasks or thermal bottles.

• Insulated flasks and bottles use a double-layered wall that traps heat efficiently.
• The tight-fitting lid minimizes heat loss.
• High-quality insulated materials are effective in maintaining the temperature.
• Choose the right size to avoid frequent openings, which reduce heat retention.

Additional factors to consider when using thermal flasks or vacuum bottles are their durability, portability and design.

For optimal results with thermal flasks or vacuum bottles, preheat them by filling them with hot water for a few minutes. Then, pour in the hot coffee immediately, and tightly seal the lid while avoiding excess air inside.

Another way of keeping coffee warm involves using insulated cups that possess lids designed for retaining temperature for longer periods.

By utilizing these methods properly, one can savor warm coffee that sustains its flavor over an extended period without requiring electricity. Who needs electricity when you can use simple tricks to keep your coffee warm and cozy, like wrapping it up in a blanket or giving it a warm hug?

Tips to Keep Coffee Warm Without Electricity

To keep your coffee warm without electricity, use these solutions in the “Tips to Keep Coffee Warm Without Electricity” section. Start with hot water, add hot spices, use a French Press, keep the lid closed, avoid using a microwave, and store your coffee in a thermos.

Start with Hot Water

To maintain the warmth of your coffee, begin with using hot water. This simple trick not only preserves your warm cup but keeps it hotter for an extended period.

1. Boil sufficient water in a kettle.
2. Rinse your flask with hot water to keep it warm.
3. Pour out the hot water from the flask, ensuring that it is empty.
4. Add in your desired amount of coffee grounds or brew into your flask immediately after emptying any leftover water.
5. Seal tightly and carry with you.

Using freshly boiled hot water warms up your flask, keeping it pre-heated before pouring out any cold or unwanted temperatures. This step is crucial to sustain the heat of your coffee.

Did you know that vacuum flasks were invented by Sir James Dewar in 1892?

Spice up your coffee life by adding hot spices, because who needs electricity when you have a tongue on fire?

Add Hot Spices

The addition of piquant ingredients is an excellent way to maintain your coffee’s heat without electricity. Here’s how you can spice up your coffee:

• Infuse a cinnamon stick in your drink to increase its temperature and impart a delightful aroma.
• Along with cinnamon, ginger, cardamom, or nutmeg provide not only warmth but also bring out the coffee’s natural flavors.
• Sweets like honey, brown sugar, or maple syrup are fantastic choices for those who appreciate their coffee with a touch of sweetness. They also serve as flavor additions that elevate the sip-worthy taste experience.
• Last but not least, add some chili powder sparingly to uplift both your content and spirits while getting that extra oomph in flavor and warmth.

Additionally, bear in mind that hot spices have therapeutic properties. Cinnamon is acknowledged for increasing blood circulation and aiding digestion, while ginger is renowned for being an anti-inflammatory agent.

Some cafes worldwide serve spicy drinks during autumn or winter months as their customers ask for warmer beverages on cooler days. One such cafe created their signature “Red-Hot Latte” by mixing espresso with milk infused with cinnamon sticks and a generous amount of cayenne pepper. Even though it sounds bizarre, many individuals adore this drink owing to its warmth and invigorating nature.

Get yourself a French press, because no one deserves cold coffee, not even your worst enemy.

Use a French Press

With a French Press, you can savor hot coffee for an extended period. Here are five quick steps to use a French Press and keep your coffee warm for longer.

1. Boil water in a kettle or on the stovetop.
2. Grind fresh coffee beans and add them to your French press.
3. Pour heated water over the coffee grounds.
4. Place the lid on top of the device with the plunger up.
5. After four minutes, gently push down on the plunger to separate the brewed coffee from the grounds.

Moreover, using a preheated carafe will help keep your coffee at the ideal temperature for longer.

Pro Tip: If you want to enjoy your coffee for even longer, consider investing in a double-walled insulated French press.

Keep your coffee hot and your dreams alive – always remember to keep that lid closed tight.

Keep the Lid Closed

To maintain the warmth of your coffee without electricity, it is essential to “Keep the Cover On.” This is an effective technique to prevent heat from escaping from the coffee mug. Hot water aids in keeping beverages at a consistent temperature, and when used with a tight-fitting lid, it can keep the beverage hot for several hours.

In addition to preventing heat loss, keeping the lid closed also prevents debris or dust particles from entering the drink. A spill-proof lid will ensure that no liquid escapes in case of an accident. Therefore, it is recommended to use a lid that fits snugly on top of your favourite coffee mug or thermos flask.

Moreover, by keeping the cover closed, you might notice an increase in evaporation rate, potentially enhancing the flavour of your drink. Combine this tip with other techniques like pre-warming your mug or using a thermal carafe to maintain warm temperatures for a more extended period.

It is worth noting that according to scientific research conducted by BioMed Central’s open access journal Environmental Health 2009, prolonged exposure to high temperatures can have adverse health effects on human body systems. Therefore, take care while handling hot drinks and avoid drinking scalding liquid straight away.

Who needs a microwave when you can just wrap your coffee in a blanket and call it a cozy?

Avoid Using a Microwave

Using a Microwave for keeping your coffee warm may not be the optimal choice as it can change the taste and texture of the coffee. Plus, using a microwave may not keep it hot enough for longer periods.

Instead, you can use a thermos or vacuum flask to keep your coffee warm without electricity. These containers are designed to hold heat efficiently and prevent it from escaping. They work by having double walls with pockets of air in between that reduce heat loss.

To ensure maximum warmth retention, preheat the container by filling it with boiling water before pouring in your coffee. This will increase its internal temperature and maintain its warmth for longer durations.

In addition to using a vacuum flask, wrapping your cup with an insulated sleeve or cozy can also help keep your coffee warmer for a few extra minutes. Moreover, placing it on a warmer such as a candle heater or mug warmer pad can also prolong its temperature retention by providing extra heat from below.

By adhering to these suggestions, you’ll never have to settle for lukewarm coffee again!
Keep your coffee hot and your heart warm by storing it in a thermos, unless you’re trying to cool down a hot-headed spouse.

Store Your Coffee in a Thermos

A Thermos is a reliable and efficient solution to keep coffee warm without electricity. The built-in vacuum insulation technology of a thermos can keep your coffee hot for hours. Plus, it prevents any heat from escaping and keeps the temperature constant throughout the day.

To maximize the effectiveness of your thermos, preheat it with boiling water before pouring in your coffee. This will prevent rapid cooling, and your drink will stay warmer for longer. Also, invest in a high-quality thermos made from stainless steel or glass that is sturdy and well-insulated.

Another tip is not to open the lid frequently as this releases heat and breaks the insulation. Keeping it tightly closed maintains a good internal temperature.

Lastly, carrying your Thermos in an insulated bag or wrapping it with a towel can help to further enhance the insulation qualities by adding an extra layer barrier against outside temperatures.

I met John at an early morning fishing trip on a chilly day. He offered me some coffee that he had brewed two hours ago yet upon tasting it was still quite hot. When I asked him how he managed to keep it warm without electricity, he quickly pulled out his trusty thermos flask, which held enough coffee for both of us!

Remember, a cold cup of coffee is just a missed opportunity for warmth.

Conclusion

Looking for ways to keep your coffee warm without electricity? Look no further. By using simple methods like insulation, preheating your mug, or even investing in a thermos, you can ensure that your coffee stays warm for longer periods of time. It’s important to note that the type of container you use also plays a role in how well your coffee retains its heat. Consider choosing a double-walled container or one made from materials like ceramic or stainless steel. Additionally, adding a lid can help prevent heat from escaping.

Pro Tip: By adding hot water to your thermos or mug before pouring in your beverage, you can further improve on the vessel’s ability to retain heat.

Frequently Asked Questions

Q: How can I keep my coffee warm without electricity?

A: You can keep your coffee warm without electricity by using a thermal carafe, a portable mug warmer, or a candle warmer.

Q: Can I use a thermos to keep my coffee warm?

A: Yes, a thermos is designed to keep beverages hot for an extended period of time, so it is an excellent choice for keeping coffee warm without electricity.

Q: What is a portable mug warmer?

A: A portable mug warmer is a battery-operated device that can keep your coffee warm for a few hours. It is small and easy to carry around, making it a perfect option for on-the-go coffee drinkers.

Q: How do I use a candle warmer to keep my coffee warm?

A: To use a candle warmer, place a jar candle under the warmer and place your coffee mug on top. The heat from the candle will keep your coffee warm without electricity.

Q: How long can I expect my coffee to stay warm using these methods?

A: The length of time your coffee stays warm varies depending on the method you choose and the quality of your coffee mug. However, you can expect your coffee to stay warm for at least a few hours.