How To Choose The Right Size Wick When Double or Triple Wicking

For candle makers, achieving the right burn with multiple wicks—whether double or triple wicking—requires a careful balance of heat management and safety. While it’s not commonly recommended for most candle projects, multiple wicking can be a safe option when using larger, heat-resistant glass containers. Here’s a guide to help you choose the correct wick size and placement when double or triple wicking, along with best practices to ensure safety and performance.

Why You Can’t Simply Duplicate a Single Wick Size

When creating a multi-wick candle, it’s essential to avoid simply duplicating the wick size used for a single-wick candle. Each wick has a melt pool and flame intensity suited for a particular container diameter. Duplicating the wick size means doubling the heat and flame produced, which can be extremely dangerous and lead to excessive heat buildup, cracked glass, or even fires.

Instead, when double or triple wicking, consider the approximate melt pool each wick will provide and select smaller wicks to balance the additional heat produced by multiple flames.

Understanding Melt Pool Size for Double Wicking

In double-wicking a candle, it's crucial to choose wicks that collectively create a balanced melt pool across the diameter of the container without overheating. For example, in a 10cm diameter glass container, using two ACS 5.0 wicks (or two CDN 10 wicks) may provide a good starting point.

In the diagram, you’ll notice the melt pool may not fully reach the edges of the glass initially. However, as the candle burns and the glass heats up, the combined heat from both wicks will gradually increase the melt pool. If, midway through the burn, wax remains unmelted around the edges, you can consider increasing the wick size and testing again to achieve an even burn.

Tip: Place the wicks carefully to optimize the melt pool. If placed too close together, the flames may overlap, causing an uneven burn. If placed too far apart, the wicks may overheat the sides of the glass.

Applying the Same Concept for Triple Wicking

When triple-wicking, follow the same principles. Choose wicks that, when burning together, create an approximate melt pool matching a single, larger wick. For instance, in a container with a 15cm diameter, three ACS 4.5 wicks, each with a burn diameter of approximately 5.5–6cm, can provide a well-distributed melt pool. Although the setup may initially appear undersized, consider the increased heat generated by three flames, which will naturally expand the melt pool over time.

Practical Tips for Multi-Wicking Success

Here’s a simple method for gauging the appropriate wick size for multi-wick candles:

1. Visualize Burn Coverage: Take a jar with a known wick size and turn it upside down over the container you plan to multi-wick. This gives you a visual approximation of the burn pool size each wick will create.

2. Record Your Findings: As you test-burn, take detailed notes on the candle’s performance. Observe and record signs like mushrooming (carbon buildup on the wick), the depth of the melt pool, and whether the wax fully melts to the edges midway through the burn. This information is invaluable for adjusting wick sizes and placements in future batches.

3. Focus on Safety: Multi-wicking is an advanced candle-making technique and requires careful testing. Use containers specifically designed to handle increased heat, and always test-burn each new batch to ensure safe and consistent performance. Multi-wicking without thorough testing can lead to dangerously high temperatures, personal injuries, or property damage.

A Word of Caution

Multi-wick candles, while visually stunning and capable of creating a powerful scent throw, require skill and patience. Confidence in your wick choices and a solid foundation of test burns are essential to creating a safe product. While many beautiful and safe multi-wick candles are possible, improper techniques can lead to hazardous outcomes, including personal injury and fire risks. By following best practices and diligently testing, you can create beautiful, safe, and effective multi-wick candles.