Candle Temperature: How Hot Does It Get?

Candles, with their soothing flicker and gentle warmth, have been a source of light and comfort for thousands of years. But have you ever paused to ponder how hot does a candle get? The simple act of lighting a wick triggers a fascinating dance of chemistry and physics, involving everything from combustion to capillary action.

In this blog post, we'll delve into the mesmerizing world of candle flames, exploring not just their serene beauty, but also the heat that is generated. From the role of wax to the impact of wick, we'll illuminate the intricacies of candle heat, and how to stay safe.

Understanding the Intricacies of a Candle's Heat

A candle's gentle flame might seem simple at first glance, but it's actually a complex interplay of factors that determine its heat. From the materials used in the candle to the environment it's in, every element plays a part in the fascinating dance of a candle's flame.


several pillar candles lit

What Determines the Temperature of a Candle?

The temperature of a candle flame is primarily determined by two factors: the type of fuel (wax) it burns and the wick that channels this fuel to the flame. However, external factors such as oxygen supply and ambient temperature can also impact the flame's heat.

The Role of Wax in a Candle's Heat

Wax serves as the primary fuel for a candle. As the flame melts the wax near the wick, it's drawn up into the flame to continue fueling the burn. Different types of wax can burn at different temperatures. The purity of the wax can also impact the flame temperature, with impurities often leading to a cooler burn.

The Impact of the Wick on Flame Temperature

The wick is more than just a delivery system for the wax. Its size, shape, and material composition can significantly influence the temperature of the flame. A thicker wick tends to produce a larger and hotter flame, while a thinner one might generate a smaller, cooler flame. The material of the wick also plays a role. Cotton wicks are most common and provide a stable burn, but wooden wicks can create a slightly higher temperature due to their wider structure.

How Hot Does a Candle Get: A Comprehensive Look

When it comes to understanding the heat of a candle, one must delve into the heart of the flame itself. By exploring the temperature of the flame and the wax, we can gain a more holistic understanding of the heat produced by these seemingly simple sources of light.

Measuring the Temperature of a Candle Flame

Measuring the temperature of a candle flame is not as straightforward as it may seem. The heat varies depending on which part of the flame you're measuring. Generally, a candle flame burns at around 1000°C (around 1800°F) in its hottest part - the blue area at the base of the flame.


colors of a wicks flame

The Hottest Part of a Candle Flame

The hottest part of a candle flame is usually the blue area near the base. This is where the flame has the most oxygen and thus is the best place for combustion to occur, creating temperatures between 1400-1800°F. On the contrary, the yellow part of the flame is cooler, often around 1200°F. The outermost part (red to orange in color), or the luminous mantle, is the coolest area with temperatures around 800°F to 1000°F.


  • Blue Flame: approximately 1400-1800°F

  • Yellow: approximately 1200°F

  • Orange: approximately 1000°F

  • Red: approximately 800°F


Variations in Flame Temperature

The temperature of a candle flame can vary based on several factors. The type of wax, the size and material of the wick, and even the ambient air temperature can all influence how hot a candle flame gets. Even within a single flame, there are different zones of temperature, making the simple act of burning a candle a complex and fascinating process.


How Hot Is Candle Wax?

The temperature of candle wax can be deceptive. Though it's in a liquid state when it's on the verge of being ignited by the wick, it's not nearly as hot as the flame itself. The melting point of the wax depends on its type.

  • For instance, paraffin wax, commonly used in candles, melts at around 99°F to 154°F.
  • Beeswax, another popular choice, has a higher melting point, often between 144°F to 147°F.
  • Soy’s melting point is around 130-150°F.


hot candle wax being poured


It's important to remember that while the melted wax isn't as hot as the flame, it can still cause burns if it comes into contact with skin.

Safety Measures: Avoiding Burns from Candle Heat

Amidst the fascination of candle heat and its intricacies, it's crucial to remember that safety should always come first. Understanding the potential risks of burns from candles and how to avoid them is an essential part of being a responsible candle user.

How Hot is Too Hot for Container Jars?

Candles in containers and jars are a popular choice for home decoration and ambiance. However, if the candle burns too hot, it can pose a risk. As a general rule, if the container becomes too hot to touch, it's likely too hot. A burning candle can heat the jar to over 180°F, which is hotter than most people can comfortably touch. Prolonged exposure to such high temperatures can cause the glass to crack or explode, posing a significant safety risk.

Generally, glass vessels get hotter than metal, or ceramic, as glass is a better conductor.


a thermometer


Proper Handling of Glass Candle Jars

There are several measures you can take to safely handle glass candle jars.

  • Always place your candle on a heat-resistant surface and keep it away from drafts, flammable materials, and out of reach of children and pets.

  • Never leave a burning candle unattended.

  • When extinguishing a candle, use a snuffer instead of blowing it out to avoid hot wax splattering.

  • Stop using the candle when only 1/2" of wax remains to prevent the jar from overheating.

  • Never handle the candle container with your bar hands while it is lit. Extinguish it and let it cool before handling.


Recognizing When a Candle is Burning Too Hot

If a candle flame gets too high or flickers wildly, it might be burning too hot. Other signs include a glowing or discolored wick, sooty smoke, or if the candle container becomes too hot to touch. In such cases, extinguish the candle immediately, trim the wick to about 1/4", and let the candle cool before relighting. Regularly monitoring your candles can help ensure they're burning safely and efficiently.


closeup of candle flames


The Practical Applications of Candle Heat

While candles are typically used for lighting or creating a soothing ambiance, the heat they generate can also be harnessed for practical purposes. Let's explore some of these applications.

Can a Candle Heat an Entire Room?

While a single candle cannot heat an entire room effectively due to its low BTU (British Thermal Unit) output, multiple candles can potentially raise the temperature by a few degrees in a small, well-insulated room. However, this is not a recommended or efficient way to heat a room due to safety concerns and the potential for carbon monoxide buildup.

Calculating the Number of Candles Needed for Heating

The number of candles needed to heat a room depends on the room's size, insulation, and current temperature. As a general rule, one candle generates approximately 80-100 BTUs per hour. A typical space heater generates around 5,000 BTUs, so you would need a significant number of candles to achieve the same effect, which is neither safe nor practical.

Creative Uses of Candle Heat

Beyond room heating, there are other creative ways to use candle heat. For example, fondue sets often use tea light candles to keep the cheese or chocolate warm and melted. Some camping gear includes candle lanterns that can provide both light and a bit of warmth. In survival situations, a candle can provide a small source of heat, enough to warm up canned food or melt snow for drinking water. However, these uses should always be approached with caution due to the risk of burns and fires.


Conclusion: Candle Temperatures Explored

From the intimate glow of a single flame to the practical applications and safety implications of candle heat, we've taken an enlightening journey through the world of candle temperatures. We've learned that while a candle flame might be small, it's powerful enough to cause harm if not treated with respect. However, when handled with care, it can provide light, warmth, and a soothing ambiance.

We hope you found this article helpful, and more importantly we hope it’s given you the information needed to enjoy your candles safely.

If you're looking for additional information to help you along your candle journey, feel free to read The Candle Lovers Ultimate Guide To Scented Candles here.